Grade boundaries
Edexcel International AS and A level Biology XBI11/YBI11 grade boundaries October 2025
The least raw mark that reached each grade in October 2025, as Edexcel printed it, for the whole subject and each paper.
From Edexcel’s grade boundaries for October 2025: the board’s document.
| Grade | WBI11/1out of 80 | WBI11/1Aout of 80 | WBI12/2out of 80 | WBI12/2Aout of 80 | WBI13/3out of 50 | WBI13/3Aout of 50 | WBI14/4out of 90 | WBI14/4Aout of 90 | WBI15/5out of 90 | WBI15/5Aout of 90 | WBI16/6out of 50 | WBI16/6Aout of 50 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A* | – | – | – | – | – | – | 60 | 60 | 67 | 67 | 45 | 45 |
| A | 53 | 53 | 55 | 55 | 40 | 40 | 54 | 54 | 60 | 60 | 40 | 40 |
| B | 47 | 47 | 48 | 48 | 35 | 35 | 48 | 48 | 53 | 53 | 35 | 35 |
| C | 41 | 41 | 41 | 41 | 30 | 30 | 43 | 43 | 47 | 47 | 31 | 31 |
| D | 35 | 35 | 35 | 35 | 25 | 25 | 38 | 38 | 41 | 41 | 27 | 27 |
| E | 29 | 29 | 29 | 29 | 21 | 21 | 33 | 33 | 35 | 35 | 23 | 23 |
Marks for each grade
Paper WBI11/1
- 53 out of 80 on Edexcel XBI11/YBI11 paper WBI11/1 was a grade A in October 2025.
- 47 out of 80 on Edexcel XBI11/YBI11 paper WBI11/1 was a grade B in October 2025.
- 41 out of 80 on Edexcel XBI11/YBI11 paper WBI11/1 was a grade C in October 2025.
- 35 out of 80 on Edexcel XBI11/YBI11 paper WBI11/1 was a grade D in October 2025.
- 29 out of 80 on Edexcel XBI11/YBI11 paper WBI11/1 was a grade E in October 2025.
Paper WBI11/1A
- 53 out of 80 on Edexcel XBI11/YBI11 paper WBI11/1A was a grade A in October 2025.
- 47 out of 80 on Edexcel XBI11/YBI11 paper WBI11/1A was a grade B in October 2025.
- 41 out of 80 on Edexcel XBI11/YBI11 paper WBI11/1A was a grade C in October 2025.
- 35 out of 80 on Edexcel XBI11/YBI11 paper WBI11/1A was a grade D in October 2025.
- 29 out of 80 on Edexcel XBI11/YBI11 paper WBI11/1A was a grade E in October 2025.
Paper WBI12/2
- 55 out of 80 on Edexcel XBI11/YBI11 paper WBI12/2 was a grade A in October 2025.
- 48 out of 80 on Edexcel XBI11/YBI11 paper WBI12/2 was a grade B in October 2025.
- 41 out of 80 on Edexcel XBI11/YBI11 paper WBI12/2 was a grade C in October 2025.
- 35 out of 80 on Edexcel XBI11/YBI11 paper WBI12/2 was a grade D in October 2025.
- 29 out of 80 on Edexcel XBI11/YBI11 paper WBI12/2 was a grade E in October 2025.
Paper WBI12/2A
- 55 out of 80 on Edexcel XBI11/YBI11 paper WBI12/2A was a grade A in October 2025.
- 48 out of 80 on Edexcel XBI11/YBI11 paper WBI12/2A was a grade B in October 2025.
- 41 out of 80 on Edexcel XBI11/YBI11 paper WBI12/2A was a grade C in October 2025.
- 35 out of 80 on Edexcel XBI11/YBI11 paper WBI12/2A was a grade D in October 2025.
- 29 out of 80 on Edexcel XBI11/YBI11 paper WBI12/2A was a grade E in October 2025.
Paper WBI13/3
- 40 out of 50 on Edexcel XBI11/YBI11 paper WBI13/3 was a grade A in October 2025.
- 35 out of 50 on Edexcel XBI11/YBI11 paper WBI13/3 was a grade B in October 2025.
- 30 out of 50 on Edexcel XBI11/YBI11 paper WBI13/3 was a grade C in October 2025.
- 25 out of 50 on Edexcel XBI11/YBI11 paper WBI13/3 was a grade D in October 2025.
- 21 out of 50 on Edexcel XBI11/YBI11 paper WBI13/3 was a grade E in October 2025.
Paper WBI13/3A
- 40 out of 50 on Edexcel XBI11/YBI11 paper WBI13/3A was a grade A in October 2025.
- 35 out of 50 on Edexcel XBI11/YBI11 paper WBI13/3A was a grade B in October 2025.
- 30 out of 50 on Edexcel XBI11/YBI11 paper WBI13/3A was a grade C in October 2025.
- 25 out of 50 on Edexcel XBI11/YBI11 paper WBI13/3A was a grade D in October 2025.
- 21 out of 50 on Edexcel XBI11/YBI11 paper WBI13/3A was a grade E in October 2025.
Paper WBI14/4
- 60 out of 90 on Edexcel XBI11/YBI11 paper WBI14/4 was a grade A* in October 2025.
- 54 out of 90 on Edexcel XBI11/YBI11 paper WBI14/4 was a grade A in October 2025.
- 48 out of 90 on Edexcel XBI11/YBI11 paper WBI14/4 was a grade B in October 2025.
- 43 out of 90 on Edexcel XBI11/YBI11 paper WBI14/4 was a grade C in October 2025.
- 38 out of 90 on Edexcel XBI11/YBI11 paper WBI14/4 was a grade D in October 2025.
- 33 out of 90 on Edexcel XBI11/YBI11 paper WBI14/4 was a grade E in October 2025.
Paper WBI14/4A
- 60 out of 90 on Edexcel XBI11/YBI11 paper WBI14/4A was a grade A* in October 2025.
- 54 out of 90 on Edexcel XBI11/YBI11 paper WBI14/4A was a grade A in October 2025.
- 48 out of 90 on Edexcel XBI11/YBI11 paper WBI14/4A was a grade B in October 2025.
- 43 out of 90 on Edexcel XBI11/YBI11 paper WBI14/4A was a grade C in October 2025.
- 38 out of 90 on Edexcel XBI11/YBI11 paper WBI14/4A was a grade D in October 2025.
- 33 out of 90 on Edexcel XBI11/YBI11 paper WBI14/4A was a grade E in October 2025.
Paper WBI15/5
- 67 out of 90 on Edexcel XBI11/YBI11 paper WBI15/5 was a grade A* in October 2025.
- 60 out of 90 on Edexcel XBI11/YBI11 paper WBI15/5 was a grade A in October 2025.
- 53 out of 90 on Edexcel XBI11/YBI11 paper WBI15/5 was a grade B in October 2025.
- 47 out of 90 on Edexcel XBI11/YBI11 paper WBI15/5 was a grade C in October 2025.
- 41 out of 90 on Edexcel XBI11/YBI11 paper WBI15/5 was a grade D in October 2025.
- 35 out of 90 on Edexcel XBI11/YBI11 paper WBI15/5 was a grade E in October 2025.
Paper WBI15/5A
- 67 out of 90 on Edexcel XBI11/YBI11 paper WBI15/5A was a grade A* in October 2025.
- 60 out of 90 on Edexcel XBI11/YBI11 paper WBI15/5A was a grade A in October 2025.
- 53 out of 90 on Edexcel XBI11/YBI11 paper WBI15/5A was a grade B in October 2025.
- 47 out of 90 on Edexcel XBI11/YBI11 paper WBI15/5A was a grade C in October 2025.
- 41 out of 90 on Edexcel XBI11/YBI11 paper WBI15/5A was a grade D in October 2025.
- 35 out of 90 on Edexcel XBI11/YBI11 paper WBI15/5A was a grade E in October 2025.
Paper WBI16/6
- 45 out of 50 on Edexcel XBI11/YBI11 paper WBI16/6 was a grade A* in October 2025.
- 40 out of 50 on Edexcel XBI11/YBI11 paper WBI16/6 was a grade A in October 2025.
- 35 out of 50 on Edexcel XBI11/YBI11 paper WBI16/6 was a grade B in October 2025.
- 31 out of 50 on Edexcel XBI11/YBI11 paper WBI16/6 was a grade C in October 2025.
- 27 out of 50 on Edexcel XBI11/YBI11 paper WBI16/6 was a grade D in October 2025.
- 23 out of 50 on Edexcel XBI11/YBI11 paper WBI16/6 was a grade E in October 2025.
Paper WBI16/6A
- 45 out of 50 on Edexcel XBI11/YBI11 paper WBI16/6A was a grade A* in October 2025.
- 40 out of 50 on Edexcel XBI11/YBI11 paper WBI16/6A was a grade A in October 2025.
- 35 out of 50 on Edexcel XBI11/YBI11 paper WBI16/6A was a grade B in October 2025.
- 31 out of 50 on Edexcel XBI11/YBI11 paper WBI16/6A was a grade C in October 2025.
- 27 out of 50 on Edexcel XBI11/YBI11 paper WBI16/6A was a grade D in October 2025.
- 23 out of 50 on Edexcel XBI11/YBI11 paper WBI16/6A was a grade E in October 2025.