The easy solution for your son is don’t do it all this crap. Don’t load up on 18 AP classes. Don’t spend endless hours doing test prep. Don’t take 25 ECs to build a resume.
Of course this means he needs to set his college focus to a good but not elite school where he can get a very good education, have a great experience, and get a nice job after graduation.
People need to stop feeding kids the BS that they have to go to an elite college or their life is ruined. Enjoy high school - take challenging but not overwhelming classes, join the ECs that you enjoy, and have fun.