What subject would you want an AI tutor to actually be good at?

Hey, maker of Atom here. We launch in a few days and I'm still tuning which subjects and tiers get the most attention.

Atom has four levels named after physicists (Archimedes for elementary/middle school, Newton for high school, Heisenberg for undergrad, Einstein for grad-level), and it covers physics, chemistry, biology, math, and coding, with diagrams generated as part of the explanation instead of just text.

Before launch day I'd genuinely like to know: what's a topic you've personally struggled to get a clear explanation for, at any level? Trying to make sure the tutor is actually solid on the things people get stuck on, not just the easy demo questions.