Edexcel A-level Biology grade boundaries 2025: A and B
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Which Biology are you sitting?
Edexcel offers two A level Biology specifications, and your school teaches one. The code on your paper is 9BN0 for Biology A (Salters-Nuffield) or 9BI0 for Biology B. Each is out of 300 and each has its own boundaries.
| Specification | Paper 1 | Paper 2 | Paper 3 |
|---|---|---|---|
| Biology A (Salters-Nuffield) 9BN0 | The Natural Environment and Species Survival: 2 hours, 100 marks | Energy, Exercise and Co-ordination: 2 hours, 100 marks | General and Practical Applications in Biology: 2 hours, 100 marks |
| Biology B 9BI0 | Advanced Biochemistry, Microbiology and Genetics: 1 hour 45 minutes, 90 marks | Advanced Physiology, Evolution and Ecology: 1 hour 45 minutes, 90 marks | General and Practical Principles in Biology: 2 hours 30 minutes, 120 marks |
Our Edexcel A-level Biology guide covers both, and Edexcel A-level grade boundaries 2025 has every subject.
Biology A (Salters-Nuffield) 9BN0, June 2025
From Pearson's June 2025 GCE document:
| Biology A, out of 300 | A* | A | B | C | D | E |
|---|---|---|---|---|---|---|
| June 2024 | 199 | 171 | 144 | 117 | 91 | 65 |
| June 2025 | 225 | 200 | 173 | 146 | 119 | 92 |
The line for A* rose 26, A rose 29, and the lower lines rose by between 26 and 29. Nothing else in our Edexcel set moved so far.
Biology B 9BI0, June 2025
| Biology B, out of 300 | A* | A | B | C | D | E |
|---|---|---|---|---|---|---|
| June 2024 | 205 | 170 | 144 | 119 | 94 | 69 |
| June 2025 | 217 | 188 | 160 | 132 | 105 | 78 |
Biology B rose by 9 to 18 marks across the grades, so its A* line of 217 is 8 lower than the Biology A line.
| AS, June 2025 (out of 160) | A | B | C | D | E |
|---|---|---|---|---|---|
| Biology A 8BN0 | 111 | 98 | 85 | 72 | 60 |
| Biology B 8BI0 | 92 | 81 | 70 | 60 | 50 |
Biology B AS was unchanged from 2024 at every grade: A 92, B 81, C 70, D 60, E 50.
Worked examples
- Biology A. 75, 70 and 68 on the three 100-mark papers is 213 out of 300. That is above 200 (A) and below 225 (A*), an A, 12 marks short of an A*.
- Biology B. 62 on Paper 1 (out of 90), 60 on Paper 2 (out of 90) and 85 on Paper 3 (out of 120) is 207 out of 300. That is above 188 (A) and below 217 (A*), an A, 10 marks short of an A*.
Always check that your total, the paper maxima and the code match before you read a row.
Gaps between grades in each specification
The steps in Biology A were 25 from A* to A, 27 from A to B and 27 from B to C. In Biology B they were 29, 28 and 28. Both are between 25 and 29 marks a band, and each is spread over three papers, so a band is roughly 9 marks on each paper.
That is a useful size to hold in mind when you mark your own work: a handful of method marks on each paper is the difference between two grades.
Revising with the shares
- Biology A A* is 75%, and Biology B A* is 72%.
- E needs 31% in Biology A and 26% in Biology B.
- Paper 3 is the general and practical paper in both specifications, so revise method as well as content.
Try today's Biology Year 1 or Year 2 paper (8 questions, 25 to 35 marks, not an Edexcel paper) and compare its share with your specification's row.
Common questions
What were the Edexcel A-level Biology grade boundaries in 2025?
What is the difference between Edexcel Biology A and B?
What mark is an A* in Edexcel A-level Biology 2025?
Did the Biology boundaries rise in 2025?
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UK · A-levelEdexcel A-level grade boundaries 2025: marks for every gradePearson's official June 2025 Edexcel A-level boundaries for Maths, Further Maths, Physics, Chemistry and Biology A and B, compared with 2024.