I am going to give you a different take on this then most. My sons high school has pre Calc in Sophomore(after freshman year) summer year. It’s fast but only pre approved students can accept this summer class. My son didn’t think it went too fast at all or the other students. They all finished high school at Multivarite Calc senior year. But this is the norm at his school. They even have further math classes now. As stated you need to check with your high school to see what’s allowed first.
Saying this the 3 schools you mentioned you probably won’t get into. I can say this for about any student since the acceptance rates are so low. Concentrate on your studies but make sure to have some fun. If your good at math and you could probably teach yourself to code just for fun. Do that first. Do some fun code things. Look at Codefy and other sites https://www.codefycs.org/
Some CS students will come in at Calc 1 and some more advanced. Probably more important to learn some coding then what math you will end up at. Some high schools have coding clubs, competitions, etc.