Lots of questions- starting with what you consider a high-ranked college.
Self-studying APs is not a tip when applying to US colleges.
You only need SAT OR ACt- no extra points for having both.
Remember that the higher the ranking / prestige the greater the competition for places, which in turn leads to high achieving / highly motivated /highly disciplined students which in turn can make it more challenging to be successful once you get there.
What are you looking for from a college, and why do you think that you would like the “high-ranked” colleges that you are interested in (besides the glory of the name)?