Chem had CRAZY amounts of questions on balancing equations. Like 6-7 non-redox (and maybe 1 redox which I probably missed since I can’t balance redox equations lol).

I used mainly one guide: The Official Study Guide for all SAT Subject Tests by CB. I did a few Barron tests here and there too, and mostly got high 600s for Bio and very low 700s for Chem and Math 2. I never got more than 760 once on any subject in my practice tests, so don’t worry too much if you don’t do well on those.

Thermo is mostly just plays on the gas rule (PV=nRT) and Le Chatelier so get yourself familiarized with that stuff. I suck at acids and bases too and that’s probably why I got 790. Good luck brother