IGCSE Biology (4BI1) grade boundaries — June 2025
Edexcel International GCSE (Pearson) (4BI1). The official grade thresholds for the June 2025 series — the minimum raw mark needed for each grade, by tier and paper combination. Pick the option matching the papers you sat.
Edexcel publishes these as grade threshold tables: "grade thresholds" and "grade boundaries" are two names for the same numbers.
June 2025 at a glance
- A 9 in Biology required 140/180 (78%) on overall (9–1).
- That 9 threshold is 1 mark lower than June 2024 — slightly easier to achieve.
- Across paper variants, the 9 boundary ranged from 140 to 144 marks — variant choice mattered this session.
- A grade 4 needed roughly 37% on overall (9–1).
Overall (9–1)
| Grade | Min mark | Min % |
|---|---|---|
| 9 | 140 | 78% |
| 8 | 124 | 69% |
| 7 | 109 | 61% |
| 6 | 94 | 53% |
| 5 | 79 | 44% |
| 4 | 65 | 37% |
| 3 | 54 | 30% |
| 2 | 43 | 24% |
| 1 | 32 | 18% |
Maximum mark: 180.
Overall · variant 2 (9–1)
| Grade | Min mark | Min % |
|---|---|---|
| 9 | 144 | 80% |
| 8 | 127 | 71% |
| 7 | 111 | 62% |
| 6 | 96 | 54% |
| 5 | 81 | 45% |
| 4 | 67 | 38% |
| 3 | 56 | 32% |
| 2 | 45 | 25% |
| 1 | 34 | 19% |
Maximum mark: 180.
Calculate your Biology grade →
Figures sourced from the official Edexcel grade threshold tables. Always confirm with your exam board.