These are hoped for (future) achievements right?
This is super important. Ask your parents how much they are willing and able to pay for your college. It may knock a whole bunch of colleges out of contention, or might require a merit seeking strategy. So find out and post here.
Research online and find out which schools have the strongest CS and/or math programs (hint: they’re not all Ivy League schools, or the most famous/elite schools). Then read up on each to get a deeper understanding of what they offer, what the campus culture is like, etc. That way you can start building a list.
It’s very important to create a balanced list of schools with varying degrees of selectivity, because admissions to the highest ranked schools is very unpredictable.