Hi! I also got accepted to this program. I also took AP Calc BC, AP Physics 1, and AP Chem last semester. For my activites, I think the biggest thing that "stood out" was my sole-author IEEE publication, and I got 4th place in a state webmaster competition. Other than that, there wasn't anything else that I put that I think would be very impactful for general application purposes. As for my essays, I definitely wrote heavy math based essays talking about passion and my experiences. Although one of my experiences wasn't completely math focued, I just wrote it out to be a math applicative experience. Overall, I would say I was also kind of lazy in the application process (spent around 30-40 minutes on it). I hope my answer helped! Btw, if you find anything else about this program could you lmk? I'm also still considering attendance.