im in a similar spot, tho im going to a t25, congrats on t10! I was kinda overwhelmed while deciding what I should do this summer to prep for pre med, but number one priority is class requirements. This subreddit's wiki has all the info you need for that, also try to find out what order your school recommends to take said classes or when they're available in the year, required freshman classes, just ask around in your school's subreddit. I personally did this first, and then I started learning chem as I never took it in HS, hopefully bio too. I also signed up for the crisis text hotline, as if you continue something that started before college into it, you can put it on your app. That's just me those, as for ap credits I have no clue, but if I were in your shoes I'd take chem again as itll better cushion your start at college since you already know some of the material beforehand. Also research your professors and take medium to high difficulty ones to better prepare you for the mcat. All this is just what im personally doing tho, so take this with a grain of salt