I'm from the U.S, and I would like to study mathematics/computer science. In terms of strengthening my academic qualifications, should I just take many more AP tests next year (final year of high school, which would mean that the tests are taken after applications are sent) ? I'm fairly sure I can self-study at least 3-4 major science courses, but I have not really done much self-studying since they are not required in US universities. However, because the top universities in the UK favor them as substitutions for the A-levels, I might consider self-studying as I can probably get some basic credits in US universities as well.
AP tests junior year:
AP Physics 1, AP Statistics, AP Macroeconomics
AP tests senior year that I will be taking as part of my courseload (exams will be conditional since applications will be submitted prior):
AP Physics C Mech/E&M, AP Computer Science A, AP Calculus BC