Neither is better in general; choose by structure. Cambridge International A Level is taken all at once or staged, with the AS result counting for 13 months. Pearson Edexcel International A Level (IAL) is modular: units are banked in January, June or October, and any unit can be resat. IAL suits schools wanting more exam points.
For the headline differences in subjects, grading and fees, see Cambridge vs Edexcel for schools. This guide covers the sixth-form structure itself.
How is each A Level structured?
Cambridge gives three routes, and Pearson builds the qualification from units. The Cambridge Handbook 2026 (section 2.5.2) lists the Cambridge options: take “the Cambridge International AS Level only”; take “the AS Level in Year 1 and complete the Cambridge International A Level in Year 2”; or take “all papers of the Cambridge International A Level course in the same series”. Pearson describes its IALs as “modular qualifications” that “can be claimed on completion of the required units”.
| Cambridge International AS & A Level | Pearson Edexcel IAL | |
|---|---|---|
| Structure | Linear, or staged AS then A Level | Modular units, banked and cashed in |
| Series | June and November (March in India) | January, June and October; not every unit runs in every series |
| Using AS towards A Level | Carry forward “twice within 13 months” | IAS units bank towards the IAL |
| Resits | Retake the syllabus’s written components; moderated coursework marks can carry forward | ”Any unit can be resat”; better of two most recent attempts counts (best attempt in Mathematics) |
| Grade | From component marks in the award series | From banked unit scores on the Uniform Mark Scale |
| Claiming the grade | Carry-forward option code at entry | Cash-in code must be entered: “no grade can be issued unless the cash-in code is entered” |
| Study time | About 180 guided learning hours for AS, 360 for A Level | Set per unit in each specification |
Sources: Cambridge Handbook 2026, 9709 syllabus 2026–2027, Pearson IAL Information Manual 2025/26.
What does this look like in Mathematics?
The same subject shows the contrast clearly. Cambridge 9709 has six components. AS takes two and A Level takes four, with Paper 1 always included. Pearson IAL Mathematics has 14 “equally weighted units”, each examined in 1 hour 30 minutes.
| Cambridge 9709 | Pearson IAL Mathematics | |
|---|---|---|
| AS | Paper 1 plus Paper 2, 4 or 5 | P1 and P2, plus M1, S1 or D1 |
| Full A Level | Papers 1 and 3, plus 4 and 5, or 5 and 6 | P1–P4, plus M1 and S1, M1 and D1, M1 and M2, S1 and D1, or S1 and S2 |
| Restrictions | The Pure-only AS (Papers 1 and 2) “cannot then … carry forward to complete the A Level”; Papers 4 and 6 cannot be combined | Units used for one cash-in “cannot be re-used” for another title |
| When sat | Staged over two series, or all four papers in one series | Unit by unit; P1–P4, M1, M2, S1 and S2 also run in October |
Sources: Cambridge 9709 syllabus 2026–2027; Pearson IAL Mathematics specification.
The Pure-only AS rule catches schools out. A student who takes Cambridge Papers 1 and 2 in Year 12 cannot build on that AS for the full A Level. Choose the AS route with the A Level in mind.
How long does a Cambridge AS result last?
About a year. Cambridge’s example: AS results from the June 2026 series can be used “towards a Cambridge International A Level in the November 2026 and/or June 2027 series”. A student who sits AS in June of Year 12 and does badly at A Level in June of Year 13 has used both carry-forward chances. Retaking in November of Year 13 then means resitting the AS papers too. IAL units have no stated expiry, so a student can resit one weak unit in October.
Which suits UCAS applicants?
Both can provide real grades before applications, if the school plans for it. Cambridge’s staged route produces an AS grade in August of Year 12, before most UCAS deadlines. The IAL can do the same, and adds a January series, so some units are banked by March of Year 12. A banked result is stronger evidence than a prediction. See UCAS predicted grades for international schools.
The linear Cambridge route gives no external grade before applications. Predictions then rest entirely on school evidence. See our predicted grades framework.
What does each mean for the exams office?
More series means more work. A Cambridge sixth form sits in June, with November used for retakes. An IAL sixth form can have candidates in January, June and October, each with its own entry deadline, cash-in entries and results day. The IAL resit and modular strategy guide lists the 2026-27 dates. Schools with one exams officer should plan cover before adding series. Modular exams also take teaching weeks in January and October. Staged Cambridge AS takes time in June of Year 12.
Which should your school choose?
Choose per subject and per cohort. This guide is our recommendation, not a board rule:
| Your situation | Leans towards |
|---|---|
| Students need resit chances and banked grades early | Pearson IAL |
| You want fewer exam sessions and more teaching time | Cambridge, linear or staged |
| Students start at different points in the year | Pearson IAL (three series) |
| Wide subject choice in one sixth form | Cambridge (55 AS & A Level subjects) |
| You want an AS certificate after Year 12 | Either: Cambridge staged, or IAS cash-in |
| One exams officer, limited capacity | Cambridge |
| Students aiming at the Cambridge AICE Diploma | Cambridge (entries over up to “five series within a 25-month period”) |
Many schools mix, for example Cambridge sciences with Pearson IAL Mathematics. If you do, keep the two boards’ calendars in one exams plan. See the mock exam calendar and adding A Levels.
How schools do this with AI Buddy
AI Buddy covers Cambridge and Pearson Edexcel AS & A Level with past-paper-style questions, marked instantly. For IAL, teachers can see readiness by unit before each entry deadline. For Cambridge, they can check whether a student is secure on AS content before deciding on the staged or linear route. Entry and resit decisions stay with the school and the student.
Frequently asked questions
Is Cambridge A Level linear or modular?
Neither, strictly. It can be taken linearly, with all papers in one series, or staged, with AS first and its result carried forward within 13 months. Edexcel IAL is modular, with units banked across series.
Which is easier, Cambridge or Edexcel A Level?
Neither board claims to be easier, and there is no official comparison of difficulty. They differ in structure: IAL offers more resit points, while Cambridge’s staged route gives fewer, larger exam sessions.
Can a Cambridge AS Level be carried forward to A Level?
Yes, if the syllabus allows it, twice within 13 months of the AS series. For example, a June 2026 AS can count towards A Level in November 2026 and/or June 2027.
Can students resit individual Edexcel IAL units?
Yes. Any unit can be resat. The better of the two most recent attempts counts, or the best attempt in Mathematics.
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Sources
- Cambridge International, Cambridge Handbook 2026, sections 2.5.1–2.5.3
- Cambridge International, AS & A Level Mathematics 9709 syllabus for 2026 and 2027 and Cambridge International AS & A Levels
- Pearson, International Advanced Level Information Manual 2025/26
- Pearson, IAL Mathematics, Further Mathematics and Pure Mathematics specification, Issue 3