Billion dollar endowment? Sounds like PA. I know of a bunch of athletes who went there as PG’s. They did very well academically at mediocre high schools. The high academics recruiting them wanted to see them succeed in a more demanding academic environment before college. Plus it’s theoretically a red shirt year without starting the NCAA “five to play four” clock.
I went to Brooks in North Andover freshman year. I fit academically. As a jock, public school kid I didn’t fit socially with (Of course I only stay at The Plaza when I’m in Manhattan and we summer in The Hamptons) boarders. My high school was grades 10-12. Being at a Class B NEPSAC allowed me to play varsity sports freshman year. I went back to my school district’s high school soph year.