A-levels are usually the better fit if you want to concentrate on a few subjects. The IB Diploma is usually the better fit if you want to keep studying across several subject areas and are willing to manage research, coursework and compulsory core activities alongside them.
Both can prepare you for university. Neither is automatically more impressive, easier or better for admission.
The useful question
Which programme lets you take the subjects your future courses require, achieve strong results and keep a workload you can sustain?
This guide explains the differences, the common mistakes to avoid and how to make a decision based on your actual options.
A-levels vs IB at a glance
| What matters | A-levels | IB Diploma Programme |
|---|---|---|
| Usual duration | Two years | Two years |
| Subjects | Usually three; some students take four | Six, plus the core |
| Subject choice | You specialise in your chosen subjects, within school and timetable limits | You choose within a framework covering several subject groups |
| Levels | AS qualifications may be available; how they relate to the A-level depends on the system | Three or four Higher Level (HL) subjects; the rest at Standard Level (SL) |
| Compulsory core | No equivalent within standard UK or International A-levels | Theory of Knowledge, Extended Essay and Creativity, Activity, Service |
| Assessment | Depends on subject, board and qualification; often heavily exam based | Subject exams plus internally assessed work; formats and weightings vary |
| Results | Separate subject grades from A* to E (U is unclassified) | Subjects graded 1–7; maximum diploma total of 45 |
| Main planning challenge | Choosing a combination that keeps your intended degrees open | Choosing suitable HL subjects while managing all six subjects and the core |
| Likely appeal | Greater control over which subjects you continue | Continued breadth with advanced study in selected subjects |
The IB states that each student takes a minimum of three and a maximum of four subjects at HL, with the rest at SL. Do not assume every school offers every permitted combination.
Note
This article mainly compares UK and International A-levels with the full IB Diploma. Singapore-Cambridge A-levels have a different national structure, with H1, H2 and H3 subjects and requirements such as General Paper and Project Work (see Singapore's Ministry of Education). If you are choosing between a Singapore junior college and an IB school, compare those specific programmes.
What is the main difference between A-levels and IB?
The main difference is how much freedom you have to stop studying entire subject areas.
With A-levels, you could choose History, English Literature and Politics, or Mathematics, Physics and Chemistry. You can build a programme around the subjects you want to pursue.
With the IB, you choose from six subject groups: studies in language and literature, language acquisition, individuals and societies, sciences, mathematics, and the arts. In practice that means continuing a language, a humanities or social science subject, a science and mathematics. Your sixth subject can be an arts subject or an allowed alternative, such as a second science or a second language. Your school can explain the options within the programme rules.
That breadth can be rewarding. It also means a subject you find difficult may stay on your timetable.
Breadth does not mean shallow study
IB Higher Level subjects involve substantial advanced study. "A-levels have depth; IB has breadth" is a useful starting point, but an oversimplification.
The depth of a particular course depends on its syllabus and assessment. Taking A-level Mathematics and Further Mathematics, for example, is a different programme from taking A-level Mathematics alone.
Key point
Compare the subjects you would actually take, rather than treating every A-level or HL course as interchangeable.
What are TOK, the Extended Essay and CAS?
These compulsory core components are a major reason the IB experience differs from taking six separate subjects.
| Component | What it involves | What to consider before choosing IB |
|---|---|---|
| Theory of Knowledge (TOK) | Examining how knowledge is developed and justified; assessed through an exhibition and a 1,600-word essay | Are you willing to discuss ideas, evaluate claims and develop written arguments? |
| Extended Essay (EE) | An independent research project leading to an essay of up to 4,000 words, with supervisor guidance | Can you work on a long project in stages and respond to feedback? |
| Creativity, Activity, Service (CAS) | Creative, physical and service experiences, with reflection and evidence of learning | How will you fit meaningful activities into your academic week? |
TOK is assessed through an exhibition and a 1,600-word essay, not the presentation described in some older guides.
TOK and the EE together can contribute up to three points to your diploma total. CAS does not add points, but completing it is a requirement for the diploma, according to the IB's passing criteria.
These components build research, reflection and planning skills. They also create work beyond your six subjects.
Important
If you are being assessed from May 2027, use the updated Extended Essay guidance for your cohort. The revised EE was launched in February 2025, with first assessment in May 2027, and offers subject-focused and interdisciplinary research pathways.
Is IB harder than A-levels?
IB can be harder to organise because you balance six subjects and the core. A-levels can be demanding because your chosen subjects involve sustained advanced study and may depend heavily on exams.
There is no reliable rule that IB is harder for everyone, or that every A-level is harder than its IB equivalent. Instead, separate three kinds of difficulty.
1. Difficulty understanding the content
Look at sample lessons, syllabus topics and exam questions.
A student who enjoys algebra may find a demanding mathematics course more manageable than a less advanced language course they struggle to engage with. Subject count alone does not tell you how difficult your programme will feel.
2. Difficulty managing the workload
IB asks you to keep progressing across more subjects while planning projects and core requirements.
A-level workload depends heavily on your choices. An essay subject with coursework and an art subject with a portfolio can create a very different week from an entirely exam-assessed combination. For subject-by-subject detail, see the hardest A Levels and the easiest A Levels.
Watch out
Do not base your decision on claims that all A-level students revise a certain number of hours and all IB students revise another. Ask each school for a real timetable and assessment calendar.
3. Difficulty achieving your target results
Your goal is not simply to complete the qualification. You may need particular grades in particular subjects.
For an IB applicant, a strong overall total may still miss an offer if an HL grade is too low. For an A-level applicant, strong grades in other subjects may not make up for missing the required grade in Mathematics or Chemistry.
Key point
The better route is the one in which you can realistically meet the full conditions of your intended university offers.
Which is better if you dislike exams?
Neither programme removes the need to prepare for important exams.
IB subjects combine external exams with internally assessed work, and the core adds the EE and TOK. Exams still make up a large share of most subject grades.
A-levels also vary. Depending on the subject and board, assessment may include coursework, performances, portfolios or practical components.
Ask for the assessment breakdown
Before choosing, find out for each intended subject:
- How much of each grade comes from timed exams?
- What other work is assessed?
- When are the deadlines?
- How much supervision and feedback will you receive?
If exam anxiety is a concern, discuss support and access arrangements with the school before enrolling. Choosing a programme with coursework does not by itself resolve exam anxiety.
Are all A-levels assessed at the end of two years?
No. The assessment structure depends on which A-level qualification you take.
| Qualification | Key distinction |
|---|---|
| Reformed A-levels in England | Linear: exams are taken at the end of the course. AS is a separate qualification and does not count towards the A-level grade |
| Cambridge International AS & A Levels | Many subjects allow staged assessment, with AS results carried forward towards the full A Level within the rules |
| Pearson Edexcel International A Levels | Modular, with unit exams and opportunities to resit units under the relevant rules |
These differences matter when you plan your exams and any possible retakes. See the government's guide to AS and A level reform, Cambridge International AS & A Levels and Pearson Edexcel International A Levels.
Check
Ask your school for the exact qualification name and specification code. "We offer A-levels" is not enough information to understand your exam schedule.
Do universities prefer A-levels or IB?
Do not assume that choosing one qualification gives you an admissions advantage. Check whether your intended university accepts it and what that course requires.
Cambridge, for example, says it mostly refers to A levels and the IB for its entry requirements, and accepts international A levels from Cambridge International, Oxford AQA and Pearson Edexcel as comparable to UK A levels. Oxford Medicine lists requirements for both routes.
What matters is the detail:
- required subjects;
- required grades and, for IB, subject levels;
- any required mathematics course;
- admissions tests, interviews or portfolios;
- English-language requirements;
- rules about resits or grades achieved across different sittings.
An actual offer comparison
Oxford's published Medicine requirements currently include:
| A-level route | IB route |
|---|---|
| A*AA in three A-levels taken in the same academic year, with at least an A in Chemistry and at least one of Biology, Physics, Mathematics or Further Mathematics | 39 points including core points, with 766 at HL; Chemistry and at least one of Biology, Physics or Mathematics must be taken at HL |
Both routes are available, but the subject and grade conditions differ. That is why broad statements such as "A-levels are better for medicine" are unhelpful.
Remember
Check the course page for your entry year before making your choices.
What if you want to study overseas?
Check universities individually rather than choosing IB because you have heard "American universities prefer it", or A-levels because "British universities prefer those".
Admission and credit are separate questions. A university may accept your qualification for entry but have different rules for awarding credit or advanced standing.
If your destination uses a national recognition or equivalency process, check that too. Recognition can depend on your subject combination as well as the qualification name.
Can you convert IB points into A-level grades?
There is no universal conversion that tells you an IB total is always equivalent to a particular set of A-level grades.
An IB total includes six subjects and potentially core points. A-level results are separate subject grades. Universities set their own entry conditions for each route.
Worked example
Same total, different outcome. Consider two illustrative IB results:
- Student A: 39 points, with 766 at HL.
- Student B: 39 points, with 655 at HL and stronger SL results.
Both totals are 39, but only Student A meets an offer requiring 39 with 766 at HL.
Watch out
Use the university's published IB offer. Do not rely on a generic conversion chart, or assume that UCAS tariff points replace a course's stated requirements.
Which is better for your intended degree?
Start with entry requirements, then judge which programme suits you.
| Possible degree | What to check before choosing |
|---|---|
| Medicine | Which sciences are required, at what level and grade, and any rules about resits |
| Engineering or Physics | Mathematics and Physics requirements; whether Further Mathematics is required or recommended; accepted IB mathematics courses |
| Mathematics or Computer Science | Mathematics requirements, the role of Further Mathematics and any admissions tests |
| Economics | Mathematics requirements, particularly for quantitatively demanding courses |
| Law, History or other humanities | Any required subjects, relevant essay subjects and written work or testing requirements |
| Art, Design or Architecture | Portfolio requirements and how your school supports sustained creative work |
Your subject combination can affect which degrees you are eligible to study. Cambridge's guide to choosing high school subjects is a useful example of how universities think about this.
Mathematics choices deserve particular care
IB Mathematics: Analysis and Approaches and Mathematics: Applications and Interpretation are distinct courses, each offered at HL and SL.
Important
Do not assume they satisfy the same university requirements. Cambridge states that, for most courses requiring Mathematics, IB applicants are expected to take HL Analysis and Approaches. For Medicine, Natural Sciences (Biological) and Psychological and Behavioural Sciences, it recommends Analysis and Approaches but will also consider Applications and Interpretation.
Likewise, check how a university treats A-level Mathematics and Further Mathematics in your intended subject combination. A strong grade in an unsuitable mathematics course may still leave you ineligible for the degree you want.
Which keeps more options open if you are undecided?
IB keeps more subject areas in your education. It does not automatically keep every degree open.
Taking a science at SL may not satisfy a degree requiring that science at HL. Taking mathematics within the diploma does not mean you meet every mathematics prerequisite. A-levels can also keep a range of options open if you choose carefully.
Try it
- Write down three degree areas you might consider.
- Find the entry requirements for two universities in each area.
- Highlight required subjects and levels.
- Build an A-level combination and an IB combination that cover as many of those requirements as possible.
- Compare which combination you would enjoy and perform well in.
You do not need a fixed career plan at 16. You do need to understand which doors your choices might close.
How to choose between A-levels and IB
Step 1: Draft two actual subject plans
Write out what you would take in each programme. For example:
| A-level plan | IB plan |
|---|---|
| Biology, Chemistry, Mathematics | HL Biology, HL Chemistry, HL Mathematics: Analysis and Approaches; SL English A, SL language course, SL Geography |
This is an illustration, not a universal recommendation. Check school availability, entry criteria and university requirements.
Now assess every subject. Which ones would you look forward to? Which would need substantial support? Would you still want the IB plan once you include its SL subjects and the core?
Step 2: Compare your study habits honestly
A-levels may suit you better if you:
- want to focus on a few subjects you enjoy;
- would benefit from stopping particular subject areas;
- prefer the assessment structure of your chosen A-level courses.
IB may suit you better if you:
- want to continue learning across several disciplines;
- are willing to keep making progress in weaker subjects;
- enjoy, or want to develop, research and project-management skills.
Note
Organisation can be learned. Being disorganised now does not automatically rule out IB. Ask what support the school provides and whether you are willing to change your habits.
Step 3: Compare the schools
Teaching and support should be central to your decision.
Ask both schools
- Can I take my preferred combination without timetable clashes?
- How experienced are the teachers in those exact courses?
- How are major deadlines spread across the two years?
- What happens if I start falling behind?
- What guidance is available for university applications?
- When can I change subjects or levels?
- What are the full costs, including exams, materials, trips and possible retakes?
For IB, also ask about EE supervision, CAS support and how internal assessment deadlines are coordinated.
Speak to current students about an ordinary week and a busy week. "The programme is challenging" tells you less than a concrete explanation of assignments, feedback and deadlines.
Step 4: Check whether the plan is sustainable
Include your commute, activities, family responsibilities and rest.
A programme that fits your interests can still become difficult if the journey to school is exhausting or essential support is unavailable. Choose a course of study you can maintain for two years, including the busiest periods. Our guide to making an A Level revision timetable shows what a sustainable week looks like.
Can you retake A-levels or IB subjects?
Both have retake routes. IB students do not automatically have to repeat the entire diploma.
The IB lets previous diploma candidates retake one or more subjects to improve their results, in later exam sessions, subject to its rules. Arrange this through an IB school; curriculum changes can affect what you must study and submit.
A-level retake arrangements depend on the qualification. Resitting a linear subject is different from resitting units in a modular International A Level. If you are weighing up a resit after results, see our A-level results day 2027 guide, and Starley's past papers for exam practice.
Before planning either route, check
- whether a school or exam centre will accept you;
- which exams and other components you must complete;
- the next available session and the full cost;
- whether your intended universities accept the resulting pattern of grades.
Can you switch between IB and A-levels?
Possibly, but do not assume your completed work transfers directly.
Even where the subject names match, syllabuses and assessment requirements may differ. Moving into IB also requires a plan for six subjects and the core.
Speak to the receiving school early. Ask whether you would need to restart, what content you must catch up on and whether your university application timeline would change.
Tip
If you are struggling, first identify the problem: an unsuitable subject, a particular deadline, limited support or the programme as a whole. A targeted change may help more than changing qualifications.
Frequently asked questions
Is IB more prestigious than A-levels?
There is no useful universal prestige ranking. Choose based on accepted qualifications, suitable subjects, strong teaching and your ability to achieve the required results.
Is IB better for students who are strong at everything?
Being comfortable across several subjects can help, but IB students do not need identical strengths everywhere. Consider whether you can make steady progress in your weaker subjects alongside HL work and the core.
Can I take A-levels and still develop research skills?
Yes. Ask about opportunities such as an Extended Project Qualification, subject coursework or independent projects. See what is an EPQ? for how it works, and check the workload and relevance before adding it.
Should I take four A-levels to compete with IB students?
Do not add a fourth simply to match the IB's subject count. Check whether it serves a specific purpose, such as Further Mathematics for a mathematical degree, and whether you can sustain the workload without weakening your other results.
Can I pass IB with 24 points?
At least 24 points is required, but the total alone is not enough. The IB's passing criteria also include:
- a grade of at least 2 in every subject;
- no more than two grade 2s, and no more than three grades of 3 or below;
- at least 12 points across HL subjects and at least 9 across SL subjects;
- a grade in TOK and the EE, and completion of CAS.
What if my school only offers one programme?
First check that it offers subjects satisfying your likely university requirements. If it does, focus on teaching quality, support and your results. A different qualification label alone is not a reason to move schools.
So, should you choose A-levels or IB?
Choose A-levels if you want a focused subject programme that meets your likely university requirements. Choose IB if you want its broader curriculum, value its core components and can manage the complete programme with the support available.
If you remain undecided, compare your two subject plans, look at real assessment tasks and speak to the teachers who would teach you.
The test of a good choice
You can explain it concretely: "These subjects keep my preferred degrees open, I want to study them, and this school will help me succeed."