What Percentage Is an A* at A-Level?

It is the question every ambitious A-Level student asks: exactly what percentage do I need for an A*? The honest answer is that there is no single fixed number — but there is a reliable region, and a clear strategy for getting there.

The short answer: there is no fixed percentage

Unlike a driving test with a set pass mark, the A* at A Level is not pinned to a permanent percentage. The threshold is set fresh each exam session after all scripts are marked, so it moves. As a rough guide, an A* often lands somewhere in the region of around 90% of the overall mark, but that is a ballpark, not a promise. In some subjects and sessions the A* boundary sits a little below 90%; in others, on an unusually accessible paper, it can climb higher. Treat 90% as a working target, not a guarantee.

Why the number moves

The percentage shifts because the papers change. If a session's papers are tougher than usual, examiners lower the boundaries so that top-standard work still earns the top grade; if the papers are gentler, boundaries rise. This is deliberate: the goal is to keep an A* meaning the same level of achievement regardless of how hard a particular year's questions happened to be. A student scoring 88% one summer and 91% another could, in principle, both be awarded an A* — because the boundary was set to match the difficulty each time. You can see this movement for yourself in the published grade boundary tables.

The A* is not just about the overall total

Here is the detail that trips people up. At A Level the A* is not awarded on the overall percentage alone. It typically depends on strong performance in the A2 (second-year) components as well as a high overall total. You can hit the overall A* percentage and still need your A2 papers to be at the required standard for the A* to be confirmed. In practice this means the last-year papers carry extra strategic weight: they influence both your total and, separately, your eligibility for the very top grade. A student who front-loads a superb AS year but eases off in A2 may find the A* slips away even with a healthy overall figure.

A* versus A: how close are they?

The gap between an A and an A* is usually narrower than students imagine. An A commonly sits in the region of the low-to-mid 80s in percentage terms, with the A* perhaps 5–10 percentage points higher. Put concretely, on a 200-mark overall scale that might look like an A boundary near 160/200 (80%) and an A* boundary near 180/200 (90%) — a difference of roughly 20 marks spread across all your papers, or about five marks per paper on a four-paper subject. Framed that way, the A* is rarely about a heroic leap; it is about squeezing a few more marks out of every component. Our grade-to-percentage converter lets you see the percentage a given grade corresponds to for a specific subject and session.

Indicative regions only — real thresholds differ by subject and are confirmed each session.

How to actually reach an A*

• Aim above the boundary, not at it. Because the A* line can rise on an easy paper, plan to score in the mid-90s so a small upward shift never costs you the grade.
• Prioritise the A2 papers. They shape both your total and your A* eligibility, so they earn the biggest revision investment.
• Hunt the "easy" marks. The A*–A gap is often just a handful of marks per paper — accurate definitions, full working shown, and clean exam technique recover exactly those marks.
• Practise with real thresholds. Mark your past papers, then check the total against genuine boundaries rather than guessing.

To pressure-test your own targets, put your expected paper marks into the A-Level grade calculator and see which grade they land — then read how A-Level grading works for the full picture of how those marks become a letter.

Independent study tool. Not affiliated with, endorsed by, or connected to Cambridge Assessment International Education. Grade boundary figures are sourced from official releases; always confirm with your exam board.