The SL vs HL decision usually gets made in the first few weeks of DP1, under time pressure, often based on incomplete information. It's worth slowing down on this one — the workload gap between SL and HL math is real, and choosing HL for the wrong reasons is one of the more common regrets students report by the end of DP1.
What actually changes between SL and HL
HL isn't "SL but harder" in a vague sense — it's a specific, larger set of content taught over more class hours, with an additional exam paper (Paper 3) that SL students don't sit. HL also goes deeper into topics SL only touches lightly — proof, more advanced calculus, and (in AA) complex numbers and matrices at HL that don't appear at SL at all.
| SL | HL | |
|---|---|---|
| Teaching hours | ~150 hours | ~240 hours |
| Papers | Paper 1, Paper 2 | Paper 1, Paper 2, Paper 3 |
| Extra topics (AA) | — | Complex numbers, matrices, more calculus, proof |
| Extra topics (AI) | — | Voronoi diagrams, more advanced modelling, extended statistics |
Reasons to take HL that hold up
- You're applying to a degree that specifically requires or strongly prefers HL math (common for engineering, physics, and some economics programs)
- You're aiming for a high total IB score and math is genuinely one of your stronger subjects — HL grades are weighted the same as any other HL subject in the diploma, so it should be a subject you can actually perform well in, not just survive
- You enjoy the subject enough that the extra hours don't feel purely like a burden
Reasons to take HL that tend to backfire
"I took HL to keep my options open" is the most frequently cited reason for choosing HL, and also the most frequently regretted — especially when it comes at the cost of grades in other subjects, or when the actual degree path chosen later never needed HL math at all. If you're not sure you need it, it's worth checking actual university entry requirements rather than assuming HL is always safer.
Taking HL "just in case," or because a friend is taking it, or because SL feels like it's "not trying hard enough," are all reasons that tend not to hold up once the workload actually hits in DP1's second semester.
A more useful way to decide
- Check real prerequisites first. Look up 2-3 actual degree programs you're considering and see what they list for math — not general advice, the specific published requirements.
- Be honest about your current performance, not your ambition. If you're consistently working hard for a mid-range grade at what would be SL-level content, HL will likely be a significant struggle, not just "more of the same, but doable."
- Ask what you'd be trading off. More hours on HL math means fewer hours somewhere else — another subject, IA work, or your EE. Is math the subject where that trade-off makes sense for you?
- Talk to your math teacher honestly about whether they think HL is realistic for you specifically, not as a generic pep talk.
Try SL and HL practice questions side by side
See the actual difficulty gap for yourself before committing to a level.
✦ Try it freeFrequently asked questions
Can I move from HL to SL partway through the course?
Some schools allow this, typically only in the first semester or two of DP1 — check with your IB coordinator as early as possible if you're considering it, since later switches can be difficult to accommodate.
Does HL math count for more points than SL?
No — every IB subject, SL or HL, is graded on the same 1-7 scale and contributes the same way to your total score. HL is not "worth more points" than SL; the difference is in content depth and workload, not scoring.
Is HL math necessary for a business or economics degree?
Usually not — most business and economics programs accept SL math, and some don't require HL even for economics with a strong quantitative focus. Always verify against the specific program's requirements.