Cambridge A Level Grade Boundaries Explained: How They Work

Few questions send students searching as quickly as "What mark do I need for an A?" The honest answer has two parts. There is a number, published by the exam board after every exam series. And there is the fact that the number is different each time, for reasons that are good ones. Understanding both removes a great deal of anxiety, and a good deal of misplaced confidence too.

This guide explains how Cambridge International AS & A Level grade thresholds work: what a threshold is, how component thresholds differ from overall thresholds, why the numbers change between exam series and how to read the official tables. Every example is taken from an official Cambridge table, and each one names the exam series it comes from, because a threshold only means something alongside its series. Nothing here lets you predict a grade from your own marks, and the guide says why.

Cambridge uses the terms grade threshold and grade boundary for the same idea, and this guide uses both. The official tables are published on the exam board's website, Cambridge International, and your syllabus, past papers and teachers remain the reference for your own course. You can find the current syllabus for each subject on our syllabus pages. To turn marks into a percentage, see our A Level exam percentage calculator, and for what to do once results arrive, see what to do after A Level results.

What a Grade Threshold Actually Is

Cambridge defines a grade threshold as the minimum number of marks a candidate needs to achieve for a grade, in a paper or in a subject. It publishes thresholds after each exam series. It sets them using a mixture of statistical evidence and expert judgement, and the aim is that candidates are not given a lower grade simply because the paper they sat was harder than the previous year's.

That last point is the reason thresholds move. If one series' paper is a little harder, the marks needed for each grade are a little lower, so the standard stays comparable over time. If a paper is a little easier, the thresholds are a little higher. The standard stays the same and the numbers change.

From Raw Marks to Grades

Cambridge publishes a guide to converting component marks into syllabus grades, and a document listing the weighting factors, in the support area for teachers. They explain the journey from a raw mark to a syllabus grade in more detail than a student needs, so use them if you are a teacher or want the full picture.

Reading an Official Threshold Table

Cambridge publishes a threshold document for each syllabus and each exam series. Each one has the same two parts. To see how that looks, here is how the Mathematics (9709) document for the June 2025 series (official table, PDF) is organised.

• The title names the series and syllabus. It reads "Grade thresholds – June 2025" and "Cambridge International AS & A Level Mathematics (9709)".
• Component thresholds. Each component has a maximum raw mark and the minimum raw marks for grades A to E.
• **A note about A*.** The document states that grade A* does not exist at the level of an individual component.
• Overall thresholds. A second table lists each option, the combination of components it covers and the maximum mark after weighting, with thresholds for A* to E.

The key idea is that an A* is awarded on the overall result, not on a single paper. Components have thresholds for A to E only, and the overall table is where A* appears for A Level options. For AS options, the A* column is shown with a dash.

Example 1: Component Thresholds in One Series

Here are three components of the same syllabus in the same series, taken from the official table for Mathematics (9709), June 2025. Each has a maximum raw mark of 75. Source: Cambridge, Grade thresholds – June 2025, Mathematics (9709).

Even within one series, three components with the same maximum mark have different thresholds: the minimum for an A is 59, 61 or 62. This is the same principle as before. Different components are different papers, and each paper's thresholds reflect how demanding it was. A raw mark is only meaningful in relation to its own paper's thresholds.

Example 2: The Same Component Across Two Series

Now compare component 11 of Mathematics (9709) in two different series, again from the official tables: November 2024 and June 2025.

The minimum raw mark for an A on component 11 was 52 in November 2024 and 59 in June 2025. As a share of the 75 available, that is about 69% in one series and about 79% in the other. These are the same grade on the same component number, with a different threshold, because they are different papers sat in different series. For comparison only, the percentages are calculated here; Cambridge doesn't publish them, and they are not a rule.

The lesson is simple and worth remembering: a threshold from one series is not a guide to the next. Treating last year's number as this year's target is a common mistake.

Example 3: Overall Thresholds and Weighted Totals

Overall thresholds apply to a candidate's total after weighting, for a particular combination of components. In the official Mathematics (9709) tables, option AX covers components 11, 31, 41 and 51, with a maximum mark after weighting of 250. Here are its thresholds in the same two series.

The thresholds for the same option differ by series, and by different amounts at different grades: the A threshold was 184 in November 2024 and 198 in June 2025, while the E threshold was 62 in one and 57 in the other. That variation is also normal, and it reflects the combined difficulty of the papers in each series.

Different options in the same series also have different thresholds, because they cover different component combinations. In June 2025, for example, option AY (components 12, 32, 42, 52) had an A threshold of 198, the same as AX, but a D threshold of 105 against AX's 95. So when you read a table, make sure you are looking at the row for your own combination.

A Reading Exercise (Not a Prediction)

Here is how to use a table correctly. Suppose a weighted total of 193 out of 250 for option AX in the June 2025 series. Reading the official row, the A threshold is 198 and the B threshold is 171, so 193 falls between them: above the B threshold and below the A threshold. This is an exercise in reading the table, using a number invented for the purpose.

It is not a prediction of anyone's grade, and you should be careful with similar calculations of your own. Your results depend on how your actual papers are marked, on the weighting Cambridge applies and on the thresholds for the series you sit, which are published only after the series. Any grade you work out from a past table is an estimate of how your marks would have been treated then, not a promise about the future.

AS Options and the A* Column

The same document also lists AS options. For example, option S1 in the June 2025 Mathematics (9709) table covers components 11 and 21 with a maximum of 125, and lists thresholds of 97 for A, 82 for B, 63 for C, 45 for D and 27 for E. The A* column shows a dash, because A* is only awarded for the full A Level. If you take an AS qualification, read the AS rows, and if you take the full A Level, read the A Level options.

Why a Threshold Is Not a Grade Prediction

• It's published afterwards. Thresholds for a series are set after marking, so they cannot be known in advance.
• It changes. The same component can have a quite different threshold in another series.
• It depends on your combination. The overall thresholds you need are those for your own components.
• Weighting matters. Component marks are combined using the syllabus's weighting before the overall thresholds apply.
• Your own marking may differ. Marking your own paper against a mark scheme is a useful guide, but not the same as an examiner's final mark.

For these reasons, any website or calculator that promises you a grade from your practice marks is overpromising. Use past thresholds to get a feel for the relationship between marks and grades, and use your own consistent practice to improve the marks. Our guide to the A Level exam percentage calculator shows how to work out a percentage from your marks, and why that percentage alone is not a grade. If you already have your results, see what to do after A Level results.

How Students Can Use Thresholds Sensibly

• 1

  Find the right document. Choose your syllabus code and the exam series you are looking at.

• 2

  Read the right rows. Use the component table for individual papers and the overall table for your option.

• 3

  Compare series, not just one. Looking at two or three series shows the range, which is more honest than a single number.

• 4

  Turn it into a practice habit. Mark past papers strictly and track your raw marks over time.

• 5

  Aim above the line. Because thresholds move, a comfortable margin is safer than a bare pass mark.

You can browse real papers on our A Level past papers pages, and check which syllabus a paper belongs to on our syllabus pages. For a subject-specific starting point, see our A Level Mathematics page.

Where to Find the Official Tables

Cambridge publishes AS & A Level grade threshold tables, organised by exam series, on its website, under the AS & A Level qualification pages. Open the series you want, choose your syllabus and download its threshold document. Cambridge also explains its approach on its marking and grading page, and teachers can find the guide to converting component marks into syllabus grades and the weighting factors in the support area for teachers.

Because the tables are updated after each series, always check that you are reading the one for the series you mean, and that the syllabus code matches yours.

Common Mistakes When Reading Grade Thresholds

• Treating one series as a rule. Last series' numbers aren't this series' numbers.
• Mixing up components. Each paper has its own thresholds.
• **Looking for an A* on a component.** It's only awarded overall.
• Reading the wrong option. Overall thresholds depend on your combination of components.
• Skipping the series. A threshold without its series is meaningless.
• Trusting unofficial predictions. Only Cambridge's published results decide a grade.

Final Thoughts

Grade thresholds are a record of how marks were translated into grades in one particular series, set to keep standards fair over time. They help you understand the relationship between marks and grades, and they show why last year's number is not this year's. They don't tell you what grade you will get.

Use them with the right series, the right component and the right option, and keep your attention where it can change your result: learning the content, practising with real papers and marking strictly. When in doubt, check the official tables and ask your teacher.