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Biology
Investigate the 2025 biology themes of unity and diversity, form and function, interaction, and continuity and change.
Standard LevelHigher Level
Official global benchmark
May 2025 grade distribution
Cohort outcomes are context only—not grade boundaries or an individual grade prediction.
SL
4.3
Mean grade
21,939
students
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | N |
|---|---|---|---|---|---|---|---|
| 0.8% | 8.7% | 21.6% | 26.1% | 20.6% | 13.9% | 5.9% | 2.4% |
Source: International Baccalaureate statistical bulletin. “N” denotes no grade awarded; percentages may differ from 100 due to rounding.