Your grade journey
Cambridge AS Biologygrade boundaries
Explore official boundaries. See where your marks take you.
97007 official seriesMaximum mark 130
Exam series
Papers
Flight log / June 2026
Grade boundaries
OfficialPapers 11, 21, 31 · Out of 130
Grade a
87
marks / 130
Grade b
75
marks / 130
Grade c
65
marks / 130
Grade d
55
marks / 130
All grade thresholds
| Grade | Minimum mark | Mark range | % of maximum |
|---|---|---|---|
| a | 87 | 87–130 | 67% |
| b | 75 | 75–86 | 58% |
| c | 65 | 65–74 | 50% |
| d | 55 | 55–64 | 42% |
| e | 45 | 45–54 | 35% |
| U | Below 45 | ||
These boundaries apply to this exam series and route.
How these boundaries have changed
Papers 11, 21, 31, every official series. Boundaries move each year with how hard the papers were.
| Series | a | b | c | d | e |
|---|---|---|---|---|---|
| June 2026 | 87-3 | 75-5 | 65-4 | 55-4 | 45-4 |
| November 2025 | 90-1 | 79-1 | 68-2 | 58-2 | 48-2 |
| June 2025 | 90-6 | 80-8 | 69-8 | 59-7 | 49-6 |
| November 2024 | 91 | 80 | 70 | 60 | 50 |
| June 2024 | 96 | 88 | 77 | 66 | 55 |
+ higher than the same series a year earlier (harder to reach) · − lower (easier to reach).
Grade calculator
June 2026 · Papers 11, 21, 31
Enter your total mark to see your grade.
75 marks needed for Grade b.
Paper-by-paper entry isn’t available here: this subject's papers are weighted and the board doesn't publish the weighting factors in its boundary documents. Use your total subject mark from your results slip.
Frequently asked questions
What was the boundary for a grade a in June 2026?
87 out of 130 on papers 11, 21, 31; 87 out of 130 on papers 11, 21, 32; 86 out of 130 on papers 12, 22, 33 — the top grade for AS Biology in June 2026.
How is my grade worked out?
Your marks from each paper are added up (scaled by a weighting factor where papers count differently) to give your subject mark, which is then compared with the boundaries. Your grade comes from the total — not from each paper separately.
When will the next boundaries be published?
Cambridge publishes grade boundaries on results day for each series. Until then, any figures shown for a future series are Starley estimates, clearly labelled, based on recent years.