I really can’t speak for how what you are proposing would affect your chances at an Ivy League school or not, there are many other here that are way more knowledgeable about that than me. It does sound risky to diverge from what others are writing if that is your goal. Since you only have a few credits that you need to meet your graduation requirements then that should allow for some flexibility. I guess I was trying to suggest ways you could finish at your school and still do some of what you desire. If you can’t do every other day, what about half days? Does your school offer any virtual school options? You could also take PE and AP Biology online through BYU independent study courses for a very reasonable cost. Where do your parents stand on your plan?