Since the current Edexcel A Level Biology B specification began, the A* boundary has ranged from 176 out of 300 (November 2021) to 217 out of 300 (June 2025). Every series is below, with a link to the full boundaries for each paper.
A level (9BI0) overall grade boundaries, every series
Raw marks out of 300.
| Series | A* | A | B | C | D | E |
|---|---|---|---|---|---|---|
| June 2025 | 217 | 188 | 160 | 132 | 105 | 78 |
| June 2024 | 205 | 170 | 144 | 119 | 94 | 69 |
| June 2023 | 213 | 177 | 148 | 119 | 91 | 63 |
| June 2022 | 184 | 147 | 121 | 95 | 69 | 43 |
| November 2021 | 176 | 142 | 116 | 91 | 66 | 41 |
| October 2020 | 187 | 153 | 125 | 98 | 71 | 44 |
| June 2019 | 199 | 167 | 140 | 114 | 88 | 62 |
| June 2018 | 197 | 167 | 141 | 115 | 89 | 64 |
| June 2017 | 189 | 157 | 133 | 109 | 85 | 62 |
Grade A boundary for each A level paper
Raw marks (Pearson's notional component boundaries). Papers 1 and 2 are out of 90, Paper 3 out of 120.
| Series | Paper 1 (9BI0/01) | Paper 2 (9BI0/02) | Paper 3 (9BI0/03) |
|---|---|---|---|
| June 2025 | 51 | 63 | 74 |
| June 2024 | 44 | 61 | 65 |
| June 2023 | 51 | 56 | 70 |
| June 2022 | 43 | 46 | 58 |
| November 2021 | 43 | 42 | 57 |
| October 2020 | 41 | 52 | 60 |
| June 2019 | 46 | 57 | 64 |
| June 2018 | 47 | 54 | 66 |
| June 2017 | 44 | 52 | 61 |
AS (8BI0) overall grade boundaries, every series
Raw marks out of 160.
| Series | A | B | C | D | E |
|---|---|---|---|---|---|
| June 2025 | 92 | 81 | 70 | 60 | 50 |
| June 2024 | 92 | 81 | 70 | 60 | 50 |
| June 2023 | 92 | 81 | 70 | 60 | 50 |
| June 2022 | 92 | 79 | 66 | 54 | 42 |
| November 2021 | 87 | 74 | 62 | 50 | 38 |
| October 2020 | 92 | 78 | 64 | 50 | 36 |
| June 2019 | 93 | 82 | 71 | 61 | 51 |
| June 2018 | 93 | 83 | 73 | 63 | 53 |
| June 2017 | 84 | 74 | 64 | 54 | 45 |
| June 2016 | 91 | 80 | 70 | 60 | 50 |
There were no summer exams in 2020 or 2021. Pearson ran autumn series in October 2020 and November 2021.
Practise
Source: Pearson's published grade boundaries for each series (linked from each year's post).