IB Nature of Science SL grade boundaries
Every published cutoff for IB Nature of Science SL, by exam session and timezone. The historical graph below shows how each grade has shifted over time.
At a glance
Historical grade boundaries
Every published boundary across 5 sessions. Multiple dots per session are timezone variants.
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Common questions
Where can I find historical IB Nature of Science SL grade boundaries?
This page lists every published IB Nature of Science SL boundary across recent exam sessions, with timezone variants where they apply, plus a graph that traces each grade cutoff over time.
What if a boundary is missing for IB Nature of Science SL?
If the IBO has not released boundaries for a given session, the table omits that row. The graph reuses any earlier session that does have a published boundary so trends remain visible.
Are these IB Nature of Science SL boundaries official?
The numbers are taken from official IB grade boundary documents. They are reproduced here for reference and do not modify the published cutoffs.
More Group 4: Sciences
Other subject-level pages with full boundary tables.