I applied to the UCs and put down I was planning on taking 4 AP Exams this year, but I found out one of them wouldn’t get me any credit, and I don’t want to waste the money on it then. Should I email all the schools about my decision, or does it not matter that much?
They don’t care about that. All you have to do is successfully complete the senior courses you put on the UC app (at least 3.0 GPA and/or not more than 2 C’s depending on the campus).