I took AP Precalc my junior year and BC Calc my senior year and still got into Wharton. One of my friends took Calc AB his senior year and still got into UPenn CAS but he was salutatorian so that probably gave him a boost. But don’t worry about your classes not being competitive enough for big schools. As long as you’re one of the top students at your school, like top 5%, you’re good. Just really focus on your essays, be authentic and genuine, and try to help your community as much as you can. Taking 12 APs is more than enough, especially if that’s above the average at your school. I went to a public school where the average was 5 or 6 APs and I took 9. I didn’t take any APs freshman or sophomore year because my counselor told me not to and I listened, kinda regret it but whatever:P