Course Help??

For a Psych major who is planning on a Pre-med track, I have two questions…
Chem sequence 14 or 20?
Math 31A or 3A?
I’m sure my advisors at orientation will help too but I’d appreciate any insight about the differences between courses.

( @10s4life you may know? Maybe not but you seem to know most things lol!)

@helpmegetinlol Chem 20 and math 31 series classes are for physical science majors and engineers. Any particular reason you would want to take those versions over the less rigorous life science courses?