Testing Questions for Caltech

I know SAT, SAT Math II and one of the science SAT II’s along with teacher recommendations etc. but my question is what tests would demonstrate my abilities the most well, I enjoy physics and chemistry and math but does that mean I should take the SAT II in physics or chemistry instead of biology. I heard the biology tests were easier (Im confident I could score very highly just after an honors biology class my freshman year. What AP classes should I look to take and are AP scores necessary to show my mastery of the subject since Caltech doesn’t take AP credits. I am sorry for my weirdly worded question feel free to ask for any clarifications and any information would greatly appreciated.

Um, take all the AP at your school … That is the best way to solve your problem and to have your counsellor give you a strong recommendation when you take a rigorous course load.