HL vs SL — How to Decide Which IB Subjects to Take at Higher Level

The decision most students get wrong

The IB Diploma requires three (occasionally four) subjects at Higher Level and the remainder at Standard Level, across the six subject groups. Many students choose their HL subjects based purely on which ones they enjoy most or found easiest at the start of the Diploma. That is a reasonable starting point, but it misses two factors that matter just as much: university entry requirements, and the genuine extra workload HL subjects carry.

Check university requirements before you commit

If you already have a target degree or course in mind, check its IB subject requirements early — many competitive courses (Medicine, Engineering, Economics, and others) specify minimum HL grades in particular subjects, not just an overall points total. Choosing your HL subjects without checking this first can mean discovering, partway through Year 12 or equivalent, that a subject you took at SL needed to be at HL all along, by which point switching is difficult or impossible.

HL is not just "the same content but harder"

HL subjects add genuinely new content — entire extra topics that SL students for the same subject never study, not simply harder questions on the same material. Mathematics, the sciences, and several humanities subjects on the IB Diploma all follow this pattern: HL is SL plus an extension, not SL with a difficulty multiplier. This matters for workload planning — an HL subject is not a 20% harder version of SL, it is closer to an additional course's worth of content layered on top.

Balance your three HL subjects across different skill types

Taking three HL subjects that all demand the same kind of cognitive work — for example, three heavily essay-based humanities subjects, or three heavily mathematical sciences — concentrates your hardest deadlines and your hardest exam-revision load into the same kind of task at the same time. Many students find it more sustainable to mix HL subjects across different skill types (e.g. one essay-heavy humanity, one quantitative science, one language or arts subject), so that a heavy week in one HL subject does not automatically mean a heavy week in all three.

Consider your own genuine strengths, not just current grades

A subject you are currently getting a strong grade in at the start of the Diploma is not automatically the right HL choice if your strength is built on content that will not extend cleanly into the HL-only material. Ask your subject teacher specifically whether your strengths in the course so far (e.g. strong factual recall versus strong extended analytical writing) map onto what the HL extension content actually demands.

It is rarely too late to ask for advice, even after choosing

If you are already partway through the Diploma and increasingly unsure about an HL choice, raise it with your Diploma coordinator and subject teacher directly — they have seen this exact situation many times and can advise on what changing (or not changing) realistically looks like at your stage, rather than guessing alone.

Revising HL and SL content with ExamPass.ai

ExamPass.ai generates topic quizzes and mock papers for both HL and SL versions of supported IB subjects, pitched at the correct depth for your tier — so your practice questions reflect the actual extension content (or lack of it) your tier requires, rather than a generic version of the subject.