AP Calculus BC to AB second semester of senior year

This was a really hard decision, but ultimately I made it. I am a good student. I check off the stats, extracurriculars, and motivations colleges look for(I hope:,().
I mainly switched because I couldn’t give calc my all. I wanted to understand and learn, and yeah I was pushing through, but it wasn’t about just passing for me. I actually wanted to understand it you know? idkk
I’ve never been someone who just gets content…I always have to review things on my own and put in a little extra work. This has always worked for me until this year. It’s just so busy…
I’d rather use the ~4 hours of calc bc hw to apply to scholarships and study for the AP exams of my other courses.

I just don’t know if I ruined my chances of college. I’ve emailed nearly all of my schools, except two UCs(I just wanted to make sure this change wouldn’t be the sole reason I get rejected so I experimented). Should I email them or wait until decisions? Will this get me rescinded if I get into any of them?

No, that wouldn’t have any effect on you. If you bombed a couple of classes, then maybe.