Overview
For almost every university course, three A-Levels are what you need — the vast majority of offers are built around three subjects, and a fourth is rarely required. What matters far more than the number is taking the *right* subjects at the grades a course demands, because a specialist degree with specific subject requirements cares much more about which A-Levels you took than how many. A fourth A-Level can occasionally strengthen an application, but for most students it adds workload without adding admissions value, and stretching yourself thin across four can lower the three grades that actually count.
Three is the standard
Standard university offers are expressed in three A-Level grades — for example A*AA or BBB in specified subjects — so three is the baseline you should plan around. Taking three well-chosen A-Levels and achieving strong grades meets the requirements for the overwhelming majority of courses, including competitive ones. The focus of the A-Level system is depth, and three subjects give you room to go deep enough to hit top grades. Adding a fourth does not change the core requirement; it is an optional extra, not an expectation.
| Situation | A-Levels needed | Notes |
|---|---|---|
| Most university courses | 3 | Standard offers are in three grades |
| Highly competitive courses | 3 (right subjects) | Specific subjects matter more than number |
| Some maths-heavy degrees | 3, sometimes +Further Maths | A few top courses value or ask for Further Maths |
| Genuine all-rounder, wants stretch | 4 (optional) | Only if all grades stay high |
When a fourth A-Level is worth it
A fourth A-Level makes sense in a few specific cases: if you are aiming at a small number of courses that genuinely value it (some maths-heavy degrees look favourably on Further Maths), if you want to keep two distinct pathways open, or if you can comfortably maintain top grades across four. Outside those cases, the risk is real — spreading effort across four subjects can pull your best three grades down, and universities almost never reward a fourth if it costs you a grade in the three that matter. We cover this trade-off in detail in [is a fourth A-Level worth it](/blog/is-a-fourth-a-level-worth-it-2026).
Subject choice beats subject count
The decision that actually shapes your options is *which* A-Levels you take, not how many. Many degrees require specific subjects — Chemistry for medicine, Maths for engineering and economics, essay subjects for law and humanities — so check target-course requirements before finalising anything. "Facilitating" subjects that keep multiple doors open are a safe bet if you are undecided. Use [which A-Level subjects to take](/blog/which-cambridge-a-level-subjects-should-you-take-2026) and [best A-Level subject combinations](/blog/best-a-level-subject-combinations-2026) to match subjects to degrees, and [science vs humanities](/blog/science-vs-humanities-a-level-which-path) if you are choosing a direction.
Focus on grades, not quantity
Because offers hinge on grades in the right three subjects, your energy is best spent making those three as strong as possible. That means consistent past-paper practice against real mark schemes, so you know exactly how examiners award marks and where you are losing them — you can [self-mark instantly](/mark) to close those gaps. A student with three strong, well-matched A-Levels is in a better position than one juggling four and dropping grades. Quality and fit, not quantity, win places.
Frequently asked questions
This section covers Frequently asked questions — ranked by what Cambridge examiners return to most often in past papers.
Do you need 4 A-Levels to get into a top university?
No. Even the most selective universities make offers based on three A-Levels in the right subjects. A fourth is not required and rarely expected; some applicants take one as an optional stretch, but three strong, relevant grades are what secure places.
Is it better to take 3 A-Levels and get higher grades?
Usually, yes. For most students, three A-Levels with top grades beat four with lower grades, because offers are based on your best three in the required subjects. Only take a fourth if you are confident it will not reduce your core three grades.
Do universities prefer certain A-Level subjects?
Many courses require or prefer specific subjects — sciences and Maths for STEM and medicine, essay subjects for law and humanities. So-called facilitating subjects keep options open. Always check the exact requirements of your target courses before choosing.
Does Further Maths count as a fourth A-Level?
Further Maths is a full A-Level and is valued by some maths-heavy university courses, so it can be a worthwhile fourth for STEM-focused students. For most other degrees it is optional — take it if you enjoy maths and can maintain your grades, not just to add a subject.