As someone who took AP Physics 1 last year and am in APCSA and precalculus this year, it's absolutely necessary and I think you shouldn't do this. The same probably goes for APWH, but I'm not sure. If you really want to go ahead with this, here are some resources you can use to gain at least a surface-level understanding of each class:

APCSA: Think Java

AP Physics 1 (I'm assuming this is what you mean by AP Physics): Khan Academy (If you're taking AP Physics 2, there's this, and if you're taking one or both of the Physics C exams, I don't know.)

Precalculus: Khan Academy (If possible, make sure to check with the school curriculum to see what you'll be doing in this class).

APWH: Haven't taken, but considering that Khan Academy has a course on it, probably use Khan Academy (ignore everything from before 1200).