IB HL vs SL: How Much Harder Is It Really?
HL isn't just "more content" — the depth, complexity, and exam structure all change. Here's what you need to know.
Content: 40-60% More at HL
But the difficulty increase is non-linear. HL adds complex calculations, deeper analysis, and cross-topic connections that SL doesn't require.
Grade Boundaries Are Lower at HL
The IB recognizes HL is harder: a 7 in HL Chemistry is typically ~72% vs ~78% at SL.