<p>I read the title of this thread and seriously thought you meant a literal “Prime” number, like 2,3,5,7,11,etc. haha.
It’s good to take AP exams in your desired field though, because it helps show interest, and helps give you a foundation in the subject, regardless of if you need to retake the courses upon entrance to college, I would think.
My personal goal was to hit at least 8 total before Senior year, to have the AP National Scholar. I would think as long as you have a decent number under your belt, like at least 4, by then will show your commitment to your studies, and should look great!</p>