Why do Biology grade boundaries change every year?

Because they're set after the papers are marked, once examiners can see how hard students found that year's exam. If a paper was harder, the boundary drops so the same standard of work still earns the same grade. That's why a boundary from a previous year is never a safe prediction for this year.

Are these the marks for the whole subject or for one paper?

The whole subject. Pearson Edexcel also publishes "notional" per-paper boundaries, but those are illustrative only — your grade is decided by your total subject mark against these subject-level boundaries, so those are the numbers we show.

What's the difference between Higher and Foundation boundaries for Biology?

Higher tier targets grades 9–4 (with grade 3 as a narrow safety net); Foundation targets grades 5–1. They're different papers, so the raw-mark boundaries aren't comparable across tiers — use the table for the tier you're entered for.

What mark do I need to pass Biology?

A grade 4 is the "standard pass" and a grade 5 is a "strong pass". The exact raw mark for a 4 changes each year — see the grade 4 row above for the most recent figures, but treat them as a guide, not a fixed target.

Pearson Edexcel GCSE Biology grade boundaries

Data source: Pearson Edexcel GCSE (9-1) grade boundaries (June 2025) · 2024–2025 data · checked July 2026How we verify →

The raw marks needed for each grade in Pearson Edexcel GCSE Biology (1BI0), straight from Pearson Edexcel's official tables. Boundaries are set after every paper is marked, so a lower boundary usually means the paper was harder that year — not that the grade got easier. That's why we show more than one year.

Tiered: Higher tier targets grades 9–4 (grade 3 is a narrow safety-net grade); Foundation tier targets grades 5–1.

Reform watch:England's 2025 Curriculum & Assessment Review doesn't change GCSE or A-level content until reformed specs are first taught (national curriculum September 2028; updated GCSEs from 2029). Your 2026–2028 exams use the current specification. What's changing →

Higher tier

Out of 200 marks.

Grade	2025	2024	Change
9	167	166	+1
8	155	152	+3
7	144	139	+5
6	124	116	+8
5	104	93	+11
4standard pass	84	71	+13
3	74	60	+14

What grade is my mark? (Higher tier)

Enter your total subject mark out of 200 — the whole subject, not one paper.

/ 200

Foundation tier

Out of 200 marks.

Grade	2025	2024
5	130	130
4standard pass	111	111
3	81	81
2	51	51
1	22	22

What grade is my mark? (Foundation tier)

Enter your total subject mark out of 200 — the whole subject, not one paper.

/ 200

How to read these. A boundary is the minimum raw mark for that grade — score it or above and you get the grade. They're a whole-subject total, not a per-paper pass mark, and they change every year. Never treat a past year's boundary as this year's target. Why GCSE grade boundaries move →

Where these numbers come from

2025: Pearson Edexcel GCSE (9-1) grade boundaries, June 2025 (June 2025 series)
2024: Pearson Edexcel GCSE (9-1) grade boundaries, June 2024 (June 2024 series)
Earlier series and other qualifications are on Pearson Edexcel's grade-boundaries pages. We add boards and years as we verify each against its official file.

Frequently asked questions

See all GCSE grade boundaries, or read how GCSE grades work.