Marine Science Grade Boundaries

View IB Marine Science grade boundaries over time for SL. Understand score trends and how marks convert into final IB grades.

Grade boundaries explain how raw exam marks are converted into final IB grades from 1 to 7 and are adjusted each session to reflect exam difficulty and global student performance.

By reviewing grade boundaries over time, students and teachers can better understand expectations, identify trends, and set more accurate performance targets.

Group 4: Sciences

Grade Boundaries Over Time

Detailed Boundaries

Session	7	6	5	4	3	2
M25	69	58	49	40	28	14
M24	68	58	49	40	28	14
M23	70	61	52	43	32	15
M22	64	55	47	39	28	14
M21	62	49	38	29	17	9
M19	74	63	50	38	26	13

Frequently Asked Questions

IB Marine Science Grade Boundaries

Marine Science Grade Boundaries

Grade Boundaries Over Time

Detailed Boundaries

Frequently Asked Questions

Are IB Marine Science grade boundaries the same every year?

Do Higher Level Marine Science and Standard Level Marine Science share the same boundaries?

Should I aim exactly for the grade boundary?

Can grade boundaries predict my final grade?

Session	7	6	5	4	3	2
M25	69	58	49	40	28	14
M24	68	58	49	40	28	14
M23	70	61	52	43	32	15
M22	64	55	47	39	28	14
M21	62	49	38	29	17	9
M19	74	63	50	38	26	13

Session	7	6	5	4	3	2
M25	69	58	49	40	28	14
M24	68	58	49	40	28	14
M23	70	61	52	43	32	15
M22	64	55	47	39	28	14
M21	62	49	38	29	17	9
M19	74	63	50	38	26	13

Session	7	6	5	4	3	2
M25	69	58	49	40	28	14
M24	68	58	49	40	28	14
M23	70	61	52	43	32	15
M22	64	55	47	39	28	14
M21	62	49	38	29	17	9
M19	74	63	50	38	26	13