BYU = Brigam Young University, online courses so you can skip classes. I skipped Algebra II between Freshman and Sophomore year
My guess is no, but as your question is very high school specific, this is something your guidance counselor can answer based upon past admits from your high school to selective colleges, including Harvard. So, ask your GC!
I’m not even sure why OP needs to ask the GC; the answer is “no” presuming that you meet your HS graduation requirements.
Did your high school accept the course for credit? If so, no problem.
There’s nothing wrong with that at all. My son did something similar, taking precalculus online between sophomore and junior year, and went on to study at Princeton.
The BYU online courses are well respected.
Any tips you have to get into Princeton?
Be exceptional.
Follow the same tips as applying to Harvard. For Princeton-specific insight, your question is better suited for the Princeton forum.
It’s simple but it isn’t easy. Be an excellent student and a great athlete.
It works for Harvard and Stanford too. Yale, not so much.
Sherpa mentions just one pathway into Princeton. Being a recruited athlete is one. Merely an exceptional athlete is not, by the way - if the coach doesn’t pursue you, it doesn’t matter whether you are exceptional or not.
But most accepted students at Harvard, Princeton and the rest of the Ivy League are not recruited athletes, and there are many other pathways to admission, although all include being exceptional.
Admissions is the only department where it’s their job to make excuses. There’s ALWAYS a reason to turn down admission, and taking a BYU course would probably not even register on the radar. They have a 4% admissions rate. If you get in, be pleasantly surprised. If not…well, neither did 96% of the applicants.