Pearson EdexcelInternational A LevelLatest series: June 2026

Edexcel International A Level Biology grade boundaries

In short

Raw-mark grade boundaries for every Biology unit of the Pearson Edexcel International A Level, from January 2021 to June 2026. Each unit is converted to a uniform mark scale (UMS); the overall grade comes from the total UMS.

Unit grade boundaries (raw marks)

International A Level units are graded on a uniform mark scale; the figures here are raw-mark boundaries for each unit, as published by Pearson. Use the source document for the conversion to uniform marks. Where a unit has more than one version in a series (for example 1 and 1A), each cell shows the lowest and highest boundary.

WBI11 · Unit 1: Molecules, Diet, Transport and Health

Series	Max	A	B	C	D	E
June 2026	80	58	51	45	39	33
January 2026	80	54	48	42	36	30
October 2025	80	53	47	41	35	29
June 2025	80	54	48	42	36	30
January 2025	80	49	43	37	31	25
October 2024	80	46	40	35	30	25

Earlier series (8)

Series	Max	A	B	C	D	E
June 2024	80	49	44	39	35	31
January 2024	80	49	43	38	33	28
October 2023	80	47	41	35	30	25
June 2023	80	48	42	37	32	27
June 2022	80	37	32	27	23	19
January 2022	80	37	31	26	21	16
October 2021	80	37	31	26	21	16
January 2021	80	40	33	26	19	13

WBI12 · Unit 2: Cells, Development, Biodiversity and Conservation

Series	Max	A	B	C	D	E
June 2026	80	57–58	50–51	43–44	37	31
January 2026	80	57	50	43	37	31
October 2025	80	55	48	41	35	29
June 2025	80	57	50	43	37	31
January 2025	80	54	47	40	33	27
October 2024	80	53	46	39	32	26

Earlier series (8)

Series	Max	A	B	C	D	E
June 2024	80	58	54	50	46	42
January 2024	80	55	51	47	43	39
October 2023	80	54	49	45	41	37
June 2023	80	55	51	47	43	39
June 2022	80	45	41	37	33	29
January 2022	80	38	32	26	21	16
October 2021	80	38	32	26	21	16
January 2021	80	43	36	29	22	16

WBI13 · Unit 3: Practical Skills in Biology I

Series	Max	A	B	C	D	E
June 2026	50	36–38	31–33	26–28	21–24	17–20
January 2026	50	38	33	28	23	19
October 2025	50	40	35	30	25	21
June 2025	50	38	33	28	23	19
January 2025	50	33	29	25	22	19
October 2024	50	33	29	25	22	19

Earlier series (8)

Series	Max	A	B	C	D	E
June 2024	50	33	29	25	21	18
January 2024	50	37	32	27	23	19
October 2023	50	37	32	27	23	19
June 2023	50	39	34	29	24	20
June 2022	50	31	26	22	18	14
January 2022	50	29	25	21	18	15
October 2021	50	27	23	19	16	13
January 2021	50	33	28	23	19	15

WBI14 · Unit 4: Energy, Environment, Microbiology and Immunity

Series	Max	A*	A	B	C	D	E
June 2026	90	62–63	56–57	50–51	44–45	38–39	32–33
January 2026	90	61	55	49	44	39	34
October 2025	90	60	54	48	43	38	33
June 2025	90	61	55	49	44	39	34
January 2025	90	59	53	47	41	35	30
October 2024	90	56	50	44	38	33	28

Earlier series (8)

Series	Max	A*	A	B	C	D	E
June 2024	90	57	53	49	45	41	38
January 2024	90	50	47	44	41	39	37
October 2023	90	47	45	43	41	39	37
June 2023	90	47	45	43	41	39	37
June 2022	90	45	39	36	33	30	28
January 2022	90	54	45	37	29	22	15
October 2021	90	54	45	37	29	21	14
January 2021	90	58	49	40	31	22	13

WBI15 · Unit 5: Respiration, Internal Environment, Coordination and Gene Technology

Series	Max	A*	A	B	C	D	E
January 2026	90	67	60	53	47	41	35
October 2025	90	67	60	53	47	41	35
June 2025	90	67	60	53	47	41	35
January 2025	90	64	57	50	43	36	30
October 2024	90	63	56	49	42	35	29
June 2024	90	61	57	53	49	46	43

Earlier series (7)

Series	Max	A*	A	B	C	D	E
January 2024	90	61	56	51	46	42	38
October 2023	90	59	55	51	47	43	39
June 2023	90	59	55	51	47	43	39
June 2022	90	46	39	35	31	27	23
January 2022	90	54	45	37	29	21	13
October 2021	90	50	41	34	27	20	13
January 2021	90	55	47	38	30	22	14

WBI16 · Unit 6: Practical Skills in Biology II

Series	Max	A*	A	B	C	D	E
June 2026	50	45	40–41	35–36	30–31	25–26	21–22
January 2026	50	43	38	33	29	25	21
October 2025	50	45	40	35	31	27	23
June 2025	50	43	38	33	29	25	21
January 2025	50	42	38	34	30	26	22
October 2024	50	42	38	34	30	26	22

Earlier series (8)

Series	Max	A*	A	B	C	D	E
June 2024	50	42	38	34	30	26	22
January 2024	50	46	43	38	33	28	23
October 2023	50	46	43	38	33	28	23
June 2023	50	46	43	38	33	28	23
June 2022	50	36	31	26	21	16	11
January 2022	50	43	40	33	26	19	13
October 2021	50	42	39	32	25	19	13
January 2021	50	43	38	31	24	17	11

Sources

Figures from the grade boundary documents published by Pearson. ExaminerPrep is not affiliated with Pearson. Always check the source document for your own series and unit.

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