IB Subject Groups Explained: How to Choose Your 6 Subjects

Choosing your six IB subjects is one of the most consequential decisions you will make before starting the IB Diploma Programme. Get it right and you will have a clear path toward the universities and careers you are aiming for. Get it wrong and you could find yourself locked out of specific degree programmes, overloaded with subjects that do not suit your strengths, or two years into a course you cannot stand.

This guide covers every subject group in detail, explains the difference between Higher Level and Standard Level, maps subject choices to career pathways, and covers overlooked areas such as the Group 4 Project, the Group 6 arts-versus-extra-subject decision, and the connection between subject choices, TOK, and the Extended Essay. The content has been developed with input from certified IB examiners and subject specialists who work with IB students across all six groups every year.

What Are the 6 IB Subject Groups?

The IB Diploma Programme requires you to select one subject from each of six groups. Three or four of those subjects are studied at Higher Level (HL) and the remaining two or three at Standard Level (SL).

The six groups are:

• Group 1: Studies in Language and Literature
• Group 2: Language Acquisition
• Group 3: Individuals and Societies
• Group 4: Sciences
• Group 5: Mathematics
• Group 6: The Arts, or an additional subject from Groups 1 to 5

In addition to these six subjects, every IB student must complete three core components: Theory of Knowledge (TOK), the Extended Essay (EE), and Creativity, Activity, Service (CAS). These components are not separate graded subjects, but they interact directly with the subjects you choose. See the later section in this guide on How Your Subject Choices Affect Your TOK and Extended Essay for a full breakdown.

The total IB diploma score is out of 45 points. Each subject is graded 1 to 7, giving a maximum of 42 points from your six subjects. Up to 3 additional points are awarded based on your combined TOK essay and Extended Essay grades. The minimum score to receive the IB Diploma is 24 points.

Related IB Diploma guides: What Is the IB Diploma Programme? | IB Diploma Requirements | IB Programme Pros and Cons | 10 Reasons to Choose the IB Diploma

Group 1: Studies in Language and Literature

Group 1 is your primary language course. It is studied in your strongest language, typically your first language or the language in which you are most academically confident.

What Group 1 Covers

Three course options exist within Group 1:

• Language A: Literature focuses exclusively on literary texts and develops close reading, textual analysis, and comparative essay writing.
• Language A: Language and Literature combines literary works with non-literary texts such as media, speeches, and advertisements. It suits students who enjoy analysing language in a wider range of real-world contexts.
• Literature and Performance is an interdisciplinary course combining literary study with theatre practice. It is only available at Standard Level.

Language and Literature is the most commonly chosen option, as its broader scope builds a versatile skill set. Literature is the traditional choice for students who genuinely love deep literary analysis. Literature and Performance suits those combining academic and creative theatre interests.

Which Level Should You Take in Group 1?

Most students take their strongest language at Higher Level unless a specific university or career reason suggests otherwise. HL Group 1 is a strong asset for degrees in law, journalism, media, education, and any programme that prioritises advanced writing and analytical ability.

Bilingual students whose school offers a second Group 1 language can use it to replace the Group 2 requirement, resulting in a Bilingual IB Diploma. This is a recognised distinction that carries weight in university applications. Always check your school’s specific language offering with your IB coordinator.

Group 2: Language Acquisition

Group 2 is your second language course, designed to develop communicative and academic proficiency in a language other than your native tongue.

Language B vs Language ab Initio: Which Is Right for You?

Two distinct pathways exist in Group 2. Choosing the correct one matters for both your workload and your final grade.

Language B is designed for students with prior meaningful exposure to the target language. It is available at both Standard Level and Higher Level, and is offered in a range of languages including French, Spanish, Mandarin, German, Arabic, Japanese, and Italian, depending on your school. HL Language B is a strong choice if you are already proficient and if a second language is strategically relevant to your university plans or career goals.

Language ab Initio is designed for complete beginners or near-beginners. It is only available at Standard Level and is not appropriate for students who already have substantial exposure to the language. Common ab initio languages include French, Spanish, Mandarin, and German.

Why Language Acquisition Still Matters for University

Language proficiency signals adaptability, global awareness, and communication skill. For students considering careers in international business, diplomacy, law, medicine in multilingual contexts, or postgraduate study in non-English-speaking countries, a strong Group 2 result adds genuine value to a university application. Taking Language B at Higher Level is worth considering if you have real proficiency and if a second language is part of your broader academic identity.

Group 3: Individuals and Societies

Group 3 covers the humanities and social sciences and offers the widest variety of subject options of any group in the IB programme. This is frequently where students find the choice hardest, particularly when weighing History, Economics, Psychology, and Geography against each other.

All Group 3 Subject Options (Including Digital Society)

The current list of IB Group 3 subjects includes:

• Business Management
• Digital Society (introduced in 2023 and still missing from some older subject lists)
• Economics
• Geography
• Global Politics
• History
• Philosophy
• Psychology
• Social and Cultural Anthropology
• World Religions

Not all schools offer every subject on this list. Confirm availability at your institution before planning around a specific option.

Digital Society is a relatively recent and frequently overlooked addition to Group 3. It examines how digital technologies shape human societies, covering topics including data privacy, algorithmic governance, artificial intelligence ethics, and the political economy of the internet. For students interested in technology policy, media studies, data ethics, or social science, it is a strong option that deserves more attention in subject-planning discussions.

How to Choose Between Group 3 Subjects

The table below compares the most commonly chosen Group 3 subjects by SL and HL assessment balance, key skills, and career alignment.

For a full comparison of all Group 3 subjects including assessment criteria, study demands, and recommended HL combinations, see the complete IB Group 3 Individuals and Societies subject comparison.

Group 4: Sciences

Group 4 covers experimental and applied sciences and includes more subject options than many students realise. Many basic subject lists focus only on Biology, Chemistry, and Physics, leaving out Computer Science, Design Technology, Environmental Systems and Societies, and Sports, Exercise and Health Science.

The Full List of Group 4 Subjects

Group 4 currently includes the following subjects:

• Biology
• Chemistry
• Computer Science
• Design Technology
• Environmental Systems and Societies (ESS) (unique: can count as Group 3 OR Group 4)
• Physics
• Sports, Exercise and Health Science (SEHS)
  

ESS is a genuinely unique subject that bridges environmental science and social science. Because it can satisfy either the Group 3 or Group 4 requirement, a student who takes ESS as their Group 4 subject is free to take a second Group 3 subject such as Economics or History, adding significant flexibility to their overall combination. ESS has a meaningful Internal Assessment component and is a natural fit for students interested in sustainability, ecology, climate policy, or geography.

SEHS combines physiology, psychology, and applied sports science. It includes both practical and experimental components and is a strong option for students targeting medicine, physiotherapy, nutrition, sports performance, or health sciences. It is still underrepresented in most subject guides, which means students who would genuinely benefit from it often do not know it exists.

The Group 4 Project: What It Is and Why It Matters

The Group 4 Project is a compulsory collaborative investigation that all IB science students complete as part of their programme requirements. Students from different science disciplines work together to plan and execute a scientific investigation on a theme set by the school, then reflect individually on the interdisciplinary process.

The Group 4 Project does not contribute a specific numerical grade to your science score, but it is a diploma requirement and must be completed satisfactorily. Many students first encounter it after starting the programme, so factor its planning, collaboration, and reflection time into your workload, particularly if you are taking two or three Group 4 subjects.

Which Group 4 Subject Should You Choose?

• Biology: Foundation for medicine, nursing, pharmacy, and life sciences. High content volume but considered more accessible at SL than Physics or Chemistry for students without a heavily mathematical background.
• Chemistry: Essential for medicine at most universities. Also required for biochemistry, chemical engineering, and dentistry. Content-heavy at HL but highly valued by top universities across all science-related degrees.
• Physics: Non-negotiable for engineering, astrophysics, and physical sciences. Demands strong mathematical reasoning and pairs naturally with HL Mathematics AA.
• Computer Science: Increasingly accepted by engineering and technology programmes. A strong choice for students targeting software development, AI research, or digital product roles. Unlike other Group 4 subjects, it involves significant programming work.
• ESS: Lower mathematical demand than Biology or Chemistry. Suited to students where science is not the primary academic focus but the diploma requires a Group 4 subject.

For a full comparison of all Group 4 subjects including Internal Assessment type and university subject preferences, see the complete IB Group 4 Sciences guide.

Group 5: Mathematics

Mathematics is compulsory for every IB student. You will take one of two mathematics courses, each available at Higher Level and Standard Level, giving four distinct options. These four courses are more different from each other than most guides acknowledge, and the decision has direct consequences for university admissions.

Mathematics AA vs Mathematics AI: The Core Differences

Mathematics: Analysis and Approaches (AA) focuses on theoretical mathematical reasoning, abstraction, and proof. The syllabus includes calculus, algebra, functions, statistics, and advanced problem-solving. HL AA covers content approaching first-year university mathematics and is the preferred course for engineering, physics, economics, and mathematics-heavy degrees at most competitive universities.

Mathematics: Applications and Interpretation (AI) emphasises the practical application of mathematics to real-world problems. It places greater weight on statistics, modelling, and technology use, specifically through the Graphic Display Calculator (GDC). AI is better suited to students targeting social sciences, business, design, environmental science, and programmes where mathematics is a supporting discipline rather than a central one.

A common misconception is that AI is simply an easier version of AA. Both courses have rigorous HL options. AI HL involves sophisticated statistical modelling and is not a straightforward choice. The distinction is about the type of mathematical thinking each demands, and this matters for both your enjoyment of the course and your suitability for specific university programmes.

For a full four-way comparison including AA HL, AA SL, AI HL, and AI SL with university requirement data, read our dedicated IB Maths AA vs AI comparison guide.

For a complete breakdown of all Group 5 options, see the IB Group 5 Mathematics complete guide.

Group 6: Arts or an Extra Subject?

Group 6 is the most commonly misunderstood part of the IB structure. Students either overlook it, feel pressured into an arts subject they do not want, or do not realise they can replace it with a sixth academic subject. This section sets the record straight.

What the Group 6 Arts Subjects Include

The IB Group 6 arts subjects are:

• Dance
• Film
• Music
• Theatre
• Visual Arts

Each arts subject has a significant practical and portfolio component alongside theoretical written work. Visual Arts requires both a Comparative Study of existing artworks and a sustained coursework Exhibition of original pieces. Music requires a Performing and Composing portfolio alongside a Musical Links Investigation. Theatre is process-based and demands both written journals and a practical project. Film combines critical theory with practical production. These are demanding subjects that reward genuine artistic commitment.

Should You Replace Group 6 with an Academic Subject?

The IBO explicitly allows students to replace Group 6 with an additional subject from Groups 1 to 5. This is a legitimate strategic option, not a concession.

Consider keeping a Group 6 arts subject if:

• You are genuinely passionate about the arts and plan to pursue arts-related study at university.
• An arts subject is one of your strongest academic and creative areas.
• An arts degree programme will look at your portfolio alongside your IB grades.

Consider replacing Group 6 with an academic subject if:

• Your target universities or degree programmes expect a specific sixth subject (for example, a second science for medicine or veterinary science).
• You have no genuine connection to any of the arts subjects.
• The IA and coursework demands of an arts subject would add disproportionate pressure to an already demanding subject combination.

For a structured decision guide, see our article on IB Group 6 Arts vs taking an extra academic subject.

Higher Level vs Standard Level: What the Numbers Actually Mean

The HL vs SL distinction is the single most consequential aspect of IB subject planning, and yet most guides treat it in a paragraph. Here is what the difference actually looks like in practice.

The difference between 240 and 150 teaching hours is substantial. An HL subject demands approximately 60% more classroom time than an SL subject, and this ratio applies equally to self-study, revision, and Internal Assessment workload. Most students find three HL subjects a manageable but demanding combination. Four HLs is appropriate only when all four align with your genuine strengths and at least one specific university pathway clearly requires it.

For a full guide on deciding which subjects to study at HL, how university conditional offers are structured, and how to evaluate four HL combinations, see the IB Higher Level vs Standard Level complete guide.

How to Choose Your 6 IB Subjects: A Step-by-Step Framework

The right order in which to make your subject decisions is not the order most students use. Working backwards from your goals is significantly more effective than simply choosing subjects you enjoy.

Step 1: Research Your Target University Prerequisites

Before anything else, identify three to five degree programmes at target universities and look up their specific IB subject requirements. Most university websites publish this information under entry requirements or admissions. You will quickly identify patterns. Medical schools across the UK and Australia almost universally require HL Chemistry and HL Biology. Engineering programmes at leading universities typically specify HL Mathematics AA and HL Physics. Competitive business and economics programmes usually require HL Mathematics.

Skipping this step is the single most damaging mistake IB students make. Discovering mid-programme that your chosen subjects do not meet your preferred degree requirements leaves very limited options.

For country-specific guidance, see the planned guides on IB subjects for UK universities, IB subjects for US universities, and IB subjects for Australian universities.

Step 2: Align Subjects with Your Career Path

Once prerequisites are identified, build outward from them. If you need HL Chemistry and HL Biology for medicine, your third HL should reinforce the profile. If HL Mathematics is required for your business school targets, your remaining subjects should reflect complementary strengths in language and social sciences. See the career pathway combinations in the next section for concrete examples.

Step 3: Be Honest About Your Strengths

A grade 6 in a subject you are genuinely good at is worth far more to a university than a grade 4 in a subject chosen because it looked impressive. Universities evaluate your predicted grades, your actual grades, and the coherence of your academic profile. They want consistent, credible results across your six subjects. If a required HL subject is genuinely outside your ability range, speak to your IB coordinator about alternatives early.

Step 4: Balance Your Workload

Not all six-subject combinations carry the same workload. A combination of HL Physics, HL Chemistry, HL Mathematics AA, SL History, SL Language, and SL Language B is considerably heavier than a combination with three moderate HLs and three manageable SLs. When assessing workload, factor in the combined Internal Assessment requirements across your six subjects, your Extended Essay subject demands, and your CAS commitments.

Step 5: Check How Each Subject Is Assessed

Internal Assessments (IAs) are coursework components that count toward your final grade. The percentage contribution varies significantly by subject. A subject with a 30% IA gives you more control over a portion of your grade and adds sustained coursework demand throughout the year. A subject with a 20% IA relies more heavily on final examinations.

If you perform strongly in examinations but struggle with extended deadlines and sustained independent projects, lean toward exam-heavy subjects. If you work well under moderate sustained pressure and prefer demonstrating knowledge over time, higher IA subjects may suit your learning style better. For a broader explanation of IA formats and weightings, read What Is IB Internal Assessment?.

Recommended IB Subject Combinations by Career Path

The combinations below are starting points based on typical university requirements. Always verify specific prerequisites with your target institutions before finalising your choices.

For Medicine (UK, Australia, Singapore, Canada)

Core requirement: HL Chemistry and HL Biology are required by virtually all medical schools in these regions.

• Group 1: English A: Language and Literature SL or HL (HL strengthens personal statement writing and interview preparation)
• Group 2: Language B SL
• Group 3: Psychology SL (directly supports medical school interview topics and clinical reasoning)
• Group 4: Chemistry HL and Biology HL
• Group 5: Mathematics AA SL minimum; AA HL for research medicine or bioinformatics pathways
• Group 6: Physics SL as a third science, or replace with an arts subject if you have genuine creative practice and the university allows it

For a full country-by-country breakdown including minimum HL grade requirements at specific medical schools, see the planned guide on IB subject choices for Medicine.

For Engineering and Computer Science

Core requirement: HL Mathematics AA and HL Physics for most engineering disciplines. Software engineering pathways often accept HL Computer Science as an alternative or addition.

• Group 1: Language A SL
• Group 2: Language B SL
• Group 3: Economics SL (useful context for applied engineering and product roles)
• Group 4: Physics HL, and Chemistry HL or Computer Science HL depending on your engineering sub-field
• Group 5: Mathematics AA HL (non-negotiable for most engineering programmes at competitive universities)
• Group 6: Replace with Design Technology SL or Computer Science SL if Computer Science is not already in your Group 4

For sub-field breakdowns covering civil, mechanical, electrical, and software engineering, see the planned IB subject choices for Engineering guide.

For Business, Finance and Economics

Core requirement: HL Mathematics. Most competitive business and economics programmes strongly prefer Mathematics AA at HL over AI, particularly at LSE, Warwick, and NUS.

• Group 1: Language A HL (strong written communication is highly valued by business schools)
• Group 2: Language B SL in a major international language
• Group 3: Economics HL (the most logical and widely recognised Group 3 choice for this pathway)
• Group 4: Environmental Systems and Societies SL (satisfies the Group 4 requirement with a lower additional workload, freeing capacity for your three HLs)
• Group 5: Mathematics AA HL
• Group 6: Replace with Business Management SL (synergises directly with Economics HL for case study and real-world application skills)

For economics programme requirements by country and the Economics vs Business Management decision, see the planned guide on IB subject choices for Business and Economics.

For Law, Politics and Humanities

Core requirement: No universal subject prerequisites, but strong writing and analytical skills are essential. HL History and HL Language A are the most valued combination at leading law schools including Oxford, Cambridge, LSE, and UCL.

• Group 1: Language A HL (critical for law application essays, interview performance, and written advocacy)
• Group 2: Language B HL or SL (a second language adds meaningful profile differentiation for international law pathways)
• Group 3: History HL (strongest signal for law; builds argumentation, source criticism, and essay craft)
• Group 4: ESS SL or Psychology SL (manageable Group 4 option that preserves workload balance)
• Group 5: Mathematics AA SL or AI SL (mathematics is rarely a law prerequisite but some economics-law joint degrees may prefer AA)
• Group 6: Global Politics SL (strong complement to History HL for international law and policy pathways)

For law school requirements across the UK, US, and Australia, see the planned guide on IB subject choices for Law and Humanities.

For Students Who Are Not Sure About Their Future Direction Yet

This situation is far more common than subject guides acknowledge. The strategy for undecided students is to maximise optionality: choose subjects that keep doors open while building on existing strengths.

A high-optionality combination for an undecided student typically includes:

• A strong Group 1 at HL (analytical writing opens more doors than any other single skill)
• Mathematics AA at an appropriate level (AA SL or HL depending on ability; AI SL if mathematics is genuinely not your field)
• One science at a manageable level (Biology SL is the most broadly applicable single science for non-STEM undecided students)
• Economics or Psychology as your Group 3 subject (both are widely applicable across business, social science, health, and law pathways)
• A second language at a comfortable level (Language B SL in a major language)

For a full framework built specifically for undecided students, see the planned guide on choosing IB subjects when you do not know what you want to do yet.

How Your Subject Choices Affect Your TOK and Extended Essay

The connection between your six subjects and the IB core components is rarely explained in detail, yet it has real implications for both your workload management and your final diploma score.

Theory of Knowledge and Your Subject Groups

TOK is a compulsory course that asks you to reflect on the nature of knowledge across different disciplines. The TOK essay and exhibition require you to draw on examples from your Areas of Knowledge, which correspond broadly to your IB subject groups.

Students who take a diverse range of subjects covering both sciences and humanities typically find TOK richer and the essay easier to construct. They can draw on genuinely contrasting disciplinary perspectives on knowledge. Students with a narrow, heavily science-focused combination often find TOK more challenging because the natural science lens alone offers limited contrast for the knowledge questions the course demands.

This does not mean you should choose subjects specifically for TOK convenience. But if you are genuinely undecided between two Group 3 options, the one that adds more disciplinary diversity to your overall combination often serves you better across both TOK and the Extended Essay.

Extended Essay Subject Selection

The Extended Essay is a 4,000-word independent research essay submitted in one of your six subjects. You have the most academic credibility and the best access to course resources when writing your EE in an HL subject. Science EEs require a structured research question and investigation format. Humanities EEs are essay-based with a clear argumentative thesis.

The EE is graded in combination with your TOK essay and together they can contribute up to 3 points to your overall diploma score. Choosing to write your EE in a subject you find genuinely engaging (and where you have HL depth) materially increases your probability of scoring in the upper range.

For a full breakdown of EE subject options, research-question approaches, and planning strategy, read The Complete IB Extended Essay Guide.

Common Mistakes Students Make When Choosing IB Subjects

1. Not researching university prerequisites first. This is the most damaging error. Many students discover mid-programme that their chosen subjects do not meet the requirements for their intended degree, leaving no good alternatives.
2. Choosing subjects based on reputation rather than fit. Taking HL Physics because it looks impressive is counterproductive if your strengths lie elsewhere. Universities evaluate your actual grades, not the label of the subject you took.
3. Taking four HL subjects without clear justification. Four HLs significantly increase workload across all six subjects, Internal Assessments, and the Extended Essay. Unless a fourth HL is specifically required by a clear university pathway and you are genuinely strong in all four, three HLs is the right choice for most students.
4. Ignoring Internal Assessment workload. IAs run across the entire two-year programme. Students who choose multiple high-IA subjects find themselves managing coursework deadlines alongside exam preparation across the whole diploma.
5. Not considering Group 6 options properly. The arts vs extra subject decision deserves genuine thought. Many students either default to arts without considering the coursework demands, or abandon arts without realising it was one of their strongest subjects.
6. Choosing based on what peers are taking. Subject choices affect university applications. The right combination for a classmate may be the wrong combination for you. Your choices should reflect your strengths, your prerequisites, and your goals.

Frequently Asked Questions