What Are A Levels?

A Levels — short for Advanced Levels — are a two-year, subject-specialist qualification that students typically take between ages 16 and 18. They’re the most widely recognised pre-university qualification in the world: accepted by every UK university, by top universities in the US, Singapore, Hong Kong, Australia, Canada, and across the EU, and used in over 125 countries by both British international schools and private candidates.

Unlike broader qualifications such as the IB Diploma, A Levels are designed around depth in a small number of subjects. Most students take three A Levels, with some taking four (often when one of those is Further Mathematics). That focused depth is why A Levels are the standard route into specialist UK degrees — Medicine, Engineering, Law, Mathematics, the sciences — and why Russell Group and Oxbridge admissions are built around them.

There isn’t a single “A Level” exam board, though. Four major boards each set their own papers, mark schemes, and syllabus codes, and they fall into two distinct families:

• International boards taken at British international schools and by private candidates worldwide: Cambridge International A Level (CAIE) and Pearson Edexcel International A Level (Edexcel IAL).
• UK domestic boards taken in UK schools: AQA (Assessment and Qualifications Alliance) and OCR (Oxford Cambridge and RSA Examinations).

The qualification standard is the same across all four — universities treat an A* in AQA Maths the same as an A* in Cambridge International Maths — but the exam structure, paper format, and even the assessment philosophy differ in important ways. The rest of this guide unpacks all of that.

A Level Structure: How the Two Years Work

A Levels are split into two years of study:

• Year 12 (Lower Sixth) — the AS year. Students study around four subjects in their first year, often dropping one before Year 13. AS-Level qualifications can be taken as standalone qualifications on the international boards.
• Year 13 (Upper Sixth) — the A2 year. Students continue three (or four) subjects to the full A Level standard, sitting final exams in the summer.

How the two years connect to assessment is where the four boards diverge:

Modular Structure (Cambridge International + Edexcel IAL)

The two international boards run a modular programme. Students sit individual papers (called “units”) across the two years, with exam sessions in January and June. A typical international A Level has 6 units — usually 3 AS units in Year 12 and 3 A2 units in Year 13 — and students can re-sit individual units to improve their grade.

This flexibility suits students in international schools or following non-UK academic calendars. It also makes it easier to manage when school timetables don’t align neatly with a “sit everything at the end” model.

Linear Structure (AQA + OCR, and UK domestic Edexcel)

The UK domestic boards run a linear programme since the 2017 reforms. All A Level exams are sat at the end of Year 13, in the May–June series. There is no AS qualification contributing to the final grade — AS Levels still exist as a standalone qualification but are decoupled from the A Level.

Linear assessment rewards students who build understanding across the full two-year syllabus and can demonstrate synoptic reasoning — connecting ideas from across topics — in the final exams.

Which Structure is Better?

Neither is intrinsically better. They suit different students:

• Modular (international boards) favours students who prefer steady checkpoint-by-checkpoint progress, who benefit from re-sit flexibility, or whose school calendar doesn’t align with a single end-of-year exam window.
• Linear (UK domestic boards) favours students who want to delay assessment pressure until they’ve fully mastered the syllabus, and who can demonstrate strong synoptic reasoning under tight exam conditions.

In practice, students don’t usually choose the structure — they study whichever board their school is registered for.

The Four A Level Boards: A Practical Comparison

Board	Type	Structure	Exam Series	Typical Footprint
Cambridge International A Level (CAIE)	International	Modular (6 units)	May/June + Oct/Nov	British international schools globally; private candidates worldwide
Pearson Edexcel International A Level (Edexcel IAL)	International	Modular (6 units)	January + June	British international schools + private candidates; common in Asia and the Middle East
AQA A Level	UK domestic	Linear (3 papers, end of Year 13)	May/June only	UK independent + selective state schools
OCR A Level	UK domestic	Linear (3 papers, end of Year 13)	May/June only	UK independent + selective state schools

A few practical notes:

• Universities treat the four boards as equivalent. No university gives preference to one board over another. An A* is an A* regardless of which board issued it.
• Mark schemes differ. Past-paper practice has to match the exact board — Cambridge mark schemes phrase things differently from AQA, and the question style can vary noticeably (more on this below).
• Practical assessment differs. UK domestic boards use the Practical Endorsement (a separately reported pass/fail across 12 specified practicals, assessed by the school over the two years). Cambridge International runs a separate written Paper 5 (Planning, Analysis and Evaluation) testing experimental design. Edexcel IAL has dedicated practical-skills units (Unit 3 and Unit 6 in the sciences).

The board your school registers you for determines everything about your day-to-day study. If you’re moving between countries or switching schools, the board matters more than the qualification name.

A Level Subjects: How Many to Take, and Which Ones

How Many A Levels?

The standard A Level load is three subjects taken to A2 — almost every UK and international university degree application is built around this. Some students take four, typically when:

• They’re applying for Mathematics, Physics, Engineering, or Computer Science at competitive universities, where Further Mathematics is highly valued alongside Maths.
• They’re applying to Oxbridge or Ivy League in a quantitative discipline.
• They have the academic capacity and want to keep a broader application open.

Taking three strong A Levels at A*/A is universally better than taking four with weaker grades across the board.

Subject Groups Available at A Level

A Level offers a wide subject choice across all four boards. Roughly grouped:

Sciences: Biology, Chemistry, Physics, Computer Science, Psychology, Environmental Management (CAIE), Geology (some boards).

Mathematics: Mathematics, Further Mathematics, Statistics (as a standalone option on some boards).

Languages: English Language, English Literature, English Language and Literature, French, Spanish, German, Mandarin Chinese, Arabic, plus many others.

Humanities & Social Sciences: History, Geography, Economics, Government and Politics, Sociology, Religious Studies, Classical Civilisation, Philosophy, Law.

Business & Vocational: Business Studies, Accounting, Economics (also classed as social science).

Arts: Art and Design, Music, Drama and Theatre Studies, Film Studies, Media Studies, Design and Technology.

Not every subject is offered on every board, and individual schools choose which subjects to teach. Cambridge International, for instance, offers Environmental Management at A Level; AQA does not. Some boards run Further Mathematics as a separate qualification with its own syllabus codes.

How to Choose A Level Subjects

Subject choice is one of the most consequential education decisions a student makes — it directly determines which university degrees are accessible. The right framework:

1. Start with the target degree. Every university degree publishes its A Level requirements. Medicine asks for Chemistry plus usually Biology and a third subject at specific grades. Engineering asks for Maths and usually Physics. Law typically asks for a strong essay subject (English, History) at A. Working backwards from the target degree is the single most reliable subject-choice strategy.

2. Take Maths if you might do anything quantitative. Maths A Level keeps an enormous range of degrees open — Economics, Computer Science, all engineering disciplines, all sciences, Architecture, Finance, Data Science. Dropping Maths closes a lot of doors that students often want to reopen later.

3. The “facilitating subjects” framing is still useful. The Russell Group used to formally publish a list of “facilitating subjects” (Maths, Further Maths, English Literature, Physics, Chemistry, Biology, History, Geography, Modern and Classical Languages) that kept the widest range of degrees open. They retired the term in 2019, but the underlying logic still applies — strong essay or analytical subjects from this list are valued by competitive universities across departments.

4. Avoid combining too many similar subjects unless intentional. Three sciences with no Maths is rare for Engineering applicants. Three humanities can work but may close off science-track degrees.

5. Pick subjects you can sustain at A/A for two years.* A Level is content-heavy and assessment-intensive. An A* in three subjects you genuinely enjoy will outperform a B in three you don’t.

A Level Grading Explained

A Levels are graded A–E*, with U (ungraded) below E.

Grade	Approximate Boundary	UCAS Tariff Points
A*	~80% overall and ~90% averaged on A2 papers	56
A	~70%+	48
B	~60%+	40
C	~50%+	32
D	~40%+	24
E	~30%+	16

These are approximate percentage boundaries. The actual boundary for each grade is set after each exam series based on paper difficulty and the cohort’s performance — so the A* boundary on Cambridge Maths 9709 in June 2025 will differ from June 2026. Boards publish official grade thresholds with each results release.

The A* grade specifically requires both an overall threshold (around 80% of the total) AND a separate A2 threshold (around 90% averaged on A2 papers). This dual requirement is why A* is harder to achieve than just “getting 80% overall” — a student can hit 80% overall but miss A* by underperforming on the A2 units specifically.

UCAS Tariff Points are the UK university-admissions system’s way of converting grades into a numeric score. Most UK university offers are still made in raw grades (e.g. “A*AA at A Level”), but tariff points come up for some Foundation, Clearing, and lower-grade-requirement courses.

Grade Inflation and Boundaries

A Level grade boundaries have moved noticeably over the past decade. Pre-pandemic, A* was achieved by ~7–8% of UK A Level entries; during 2020–21 (centre-assessed grades) this rose above 19%. Boundaries have since returned closer to pre-pandemic norms but with some normalisation each year. Most universities now interpret A Level grades relative to the cohort year rather than against fixed historical benchmarks.

Assessment, Papers, and Practicals

Exam Papers

Each subject has its own paper structure, but typical patterns:

• 3 papers for a UK linear A Level (e.g. AQA Physics 7408: Paper 1, Paper 2, Paper 3 — total 3 hours each).
• 5 papers for Cambridge International A Level sciences (Paper 1 multiple choice, Paper 2 AS theory, Paper 3 AS practical, Paper 4 A2 theory, Paper 5 Planning/Analysis/Evaluation).
• 6 units for Edexcel IAL sciences (3 at AS, 3 at A2), each ~1.5–2 hours.

Maths follows a different pattern — Cambridge 9709 splits into Pure 1, Pure 2/3, plus Mechanics or Statistics; Edexcel IAL Maths uses paper codes per unit.

Practical Assessment (Sciences)

Practical work in the sciences is assessed differently across boards:

• AQA / OCR (UK linear): Practical Endorsement — students complete 12 specified practicals across the two years, assessed by the school, reported separately as Pass / Did Not Pass. The Endorsement is not part of the A Level grade itself, but most universities require a Pass for science degrees.
• Cambridge International A Level: Paper 5 (Planning, Analysis and Evaluation) is a written paper worth around 30 marks, testing experimental design, graph analysis, error propagation, and conclusion-writing under exam conditions.
• Edexcel IAL: Unit 3 and Unit 6 are dedicated practical-skills written papers testing similar skills.

Strong content students often lose marks on the practical-assessment papers because they test a different skill set from the theory papers. Targeted preparation in the run-up to exams typically yields the largest grade improvements.

Coursework

Coursework has largely been removed from UK A Levels since the 2017 reforms — most subjects are now purely exam-assessed. A few exceptions remain (Art, English Language Investigation, some Design and Technology routes). International A Levels follow similar patterns.

University Acceptance and Pathways

A Levels are the gold-standard pre-university qualification across English-medium higher education globally.

United Kingdom

• UCAS application: All UK universities admit via UCAS. Offers are typically made in A Level grades (e.g. “AAA”, “AAA”, “AA*A”).
• Russell Group: The 24 leading UK research universities (Oxbridge, Imperial, UCL, LSE, KCL, Warwick, Edinburgh, Bristol, Manchester, Durham, etc.) typically ask for AAA to A*AA for most courses, AAA for the most competitive (e.g. Cambridge Engineering, Imperial Computing, Oxford PPE).
• Oxbridge: Specific subject and grade requirements per course; many require admissions tests (TSA, MAT, BMAT, etc.) and interviews.
• Medicine: Typically AAA to A*AA with Chemistry mandatory, Biology usually required, a third subject from the sciences or Maths. UCAT and (for some schools) BMAT also required.

United States

A Levels are accepted by US universities as AP-equivalent for advanced standing credit. Top US universities (Ivy League, MIT, Stanford, Caltech) accept A Levels alongside the Common Application personal statement, SAT/ACT scores, and extracurricular profile. Three A Levels at strong grades is the typical international applicant baseline; four (often including Further Maths) strengthens quantitative applications.

Singapore

NUS, NTU, SMU, and SUTD accept A Levels with subject-specific grade requirements. NUS Engineering typically asks for AAA at A Level with Maths and Physics; NUS Medicine asks for AAA with Chemistry + Biology. Singapore admission is highly competitive — top quartile applicants typically present AAA or A*AA.

Hong Kong

HKU, CUHK, HKUST, PolyU, and CityU admit international applicants via the non-JUPAS route, which accepts A Levels directly. HKU MBBS (Medicine) typically asks for AAA with Chemistry + Biology. HKU Engineering and HKUST Engineering ask for AAA with Maths + Physics.

Australia

The Group of Eight (Melbourne, Sydney, ANU, UNSW, Monash, UWA, Adelaide, Queensland) accept A Levels with course-specific entry scores converted to their ATAR-equivalent rank.

Canada

Toronto, McGill, UBC, Waterloo accept A Levels and convert grades to percentages or letter grades for admission. Top Canadian engineering and CS programmes typically expect AAA equivalent.

International A Level vs UK A Level: What’s the Real Difference?

This is the most commonly misunderstood A Level question. Here’s the clean breakdown:

	Cambridge International / Edexcel IAL	AQA / OCR / UK Edexcel
Who takes it?	British international schools, private candidates worldwide	UK independent + state schools
Structure	Modular — 6 units across 2 years	Linear — all exams end of Year 13
Exam sessions	January + June (Cambridge also Oct/Nov)	May/June only
Practical assessment	Written practical papers (Paper 5 / Units 3+6)	School-based Practical Endorsement
Re-sits	Per-unit re-sits possible	Whole-subject re-sit only
University acceptance	Identical	Identical
Difficulty	Equivalent academic standard	Equivalent academic standard

The single most important point: universities accept both equally. Cambridge admissions doesn’t downgrade a Cambridge International A Level; LSE doesn’t favour UK Edexcel over Edexcel IAL. The qualification standard is set at the A Level level, not the board level.

How A Levels Compare to IGCSE and IB Diploma

A quick reference for parents weighing the major qualifications:

• IGCSE (or GCSE in the UK) is the pre-A Level qualification — taken at ages 14–16, the foundation that leads into A Levels. A student does IGCSE and then A Levels; they’re not alternatives.
• A Levels vs IB Diploma (IB DP): Both are pre-university qualifications at the same level. A Levels favour depth in 3 subjects; IB Diploma demands breadth across 6 subjects plus core requirements (Theory of Knowledge, Extended Essay, CAS). Top universities accept both equivalently — Cambridge will accept either A*A*A at A Level or 40+ points on IB DP for Engineering, for example. The choice depends on student fit: specialists thrive in A Level, generalists in IB.
• A Levels vs APs (US Advanced Placement): A Levels are a full school-leaving qualification; APs are individual subject exams typically taken alongside a US high school diploma. UK universities prefer A Levels for international applicants; US universities accept both with broadly equivalent standing.

If you want a deeper comparison, our A Levels vs IB: Which Should You Choose? guide covers the trade-off in depth.

Cost: A Levels as a Private Candidate

If you’re not studying A Levels in a school programme — for example, switching from a national curriculum, home-educating, or self-studying — the costs of registering as a private candidate at a Cambridge or Edexcel exam centre vary by country and centre:

• Exam entry fees per paper typically range from US$80–US$200 depending on country and centre.
• Full A Level (3 subjects, all papers) typically costs around US$1,000–US$2,500 in exam fees alone.
• Tuition costs vary widely — see our tutor city pages for live online rates.

Private candidacy is most common in Hong Kong, Singapore, the UAE, India, and Pakistan, where students often add Cambridge or Edexcel A Levels alongside their main curriculum to strengthen UK university applications.

Frequently Asked Questions

What is the difference between AS Level and A Level?

AS Level is the qualification at the end of the first year of an A Level programme (Year 12). On the international boards (Cambridge, Edexcel IAL), AS Level can be taken as a standalone qualification or count towards the full A Level. On UK domestic boards since the 2017 reforms, AS and A Level are decoupled — AS doesn’t contribute to the A Level grade.

How many A Levels should my child take?

Three is the standard. Four is helpful for students applying to competitive Maths, Engineering, Physics, or Computer Science programmes (where Further Maths alongside Maths is highly valued). More than four is rare and usually counterproductive — universities don’t reward five A Levels at lower grades over three at A*.

Is A Level harder than IGCSE?

Yes — significantly. A Level is the step up from IGCSE in depth, abstraction, and assessment style. Most students experience a noticeable jump in difficulty when starting A Level, particularly in Maths and the sciences. Targeted study habits matter more at A Level than at IGCSE.

Which A Level board is the hardest?

There’s no consensus, and the boards are calibrated to the same standard. Some teachers find OCR question style trickier; others find Cambridge International’s Paper 5 (PAE) the most demanding. Edexcel IAL is often described as more procedural and predictable. The “hardest” board varies by subject and by year.

Can my child mix and match A Levels across boards?

Yes — universities treat each A Level on its own merit regardless of board. Many private candidates take, say, Cambridge Maths alongside Edexcel Physics if their preferred subject specialist teaches different boards. This is more common in Hong Kong and Singapore than in UK schools.

Are A Levels accepted for US university applications?

Yes — every major US university accepts A Levels. Top US universities treat three strong A Levels as equivalent to a strong high-school transcript plus 3–4 APs. SAT or ACT scores are typically also required for US admission alongside the A Level profile.

What’s the Practical Endorsement and does it affect my grade?

The Practical Endorsement is a separately reported pass/fail outcome for sciences on UK linear boards (AQA, OCR, UK Edexcel). It’s assessed by the school across 12 specified practicals over the two-year course. It does not contribute to the A Level grade itself — but most universities require a Pass on the Endorsement for science degrees, so it functions as a gating requirement.

Can my child re-sit individual A Level papers?

On modular international boards (Cambridge International, Edexcel IAL), yes — individual units can be re-sat at a later exam session. On UK linear boards (AQA, OCR, UK Edexcel), the whole A Level subject must be re-sat — there’s no partial re-sit.

Do universities prefer linear or modular A Levels?

No. Both are accepted as equivalent. A* in Cambridge International A Level (modular) is interchangeable with A* in AQA A Level (linear) on every UK and international university admission decision.

What is Further Mathematics A Level?

Further Mathematics is a separate A Level taken in addition to standard Maths. It covers more advanced pure mathematics (matrices, complex numbers, advanced calculus), additional mechanics and statistics, and decision mathematics. It’s highly recommended (and sometimes required) for Maths, Engineering, Physics, and Computer Science at Cambridge, Imperial, Warwick, and MIT.

How long does it take to study A Levels?

The standard two-year (Year 12 + Year 13) programme. Private candidates self-studying outside a school programme can complete A Levels in 12–18 months with disciplined study, though most spread it over two years to align with exam sessions.

Can I take A Levels online?

You can study A Levels online — through online A Level providers, online tutoring, or self-study — but you must sit the final exams at an approved physical exam centre. The board (Cambridge International, Edexcel IAL) registers candidates against specific exam centres for each session.

Resources & Next Steps

If you’re starting an A Level programme — or your child is — the most useful next steps are:

• Pick the right subjects based on the target degree (working backwards from the university course usually clarifies subject choice).
• Confirm the exam board your school is registered for, since past-paper practice and tutor matching depend on it.
• Plan early for the practical-assessment component (Practical Endorsement for UK linear boards, Paper 5 for Cambridge, Units 3+6 for Edexcel IAL) — these are easy to underestimate.
• Use the right tutor. Online A Level tutoring is matched to your exact board and subject — see our hubs for Cambridge International A Level tutors, Pearson Edexcel International A Level tutors, AQA A Level tutors, and OCR A Level tutors. Or browse by subject across all boards: A Level Mathematics, Physics, Chemistry, Biology, English Language.

The two-year A Level programme is a significant commitment, but the upside is real: A Level grades open more universities and more degree pathways than any other pre-university qualification worldwide. Get the subject choice right, match your study to the exam board’s specific style, and the grades follow.

For the broader pre-university landscape, see our Complete IGCSE Syllabus Guide 2026 (the qualification that comes before A Levels) and A Levels vs IB: Which is Better? (the major alternative).

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