I took three AP exams this past year, which is around average for students in my grade. The highest I know of is five.
One of the exams, Calculus, required no extra studying, as taking the exam was mandatory and the class prepared for it.
The second exam, Chem, required some minor extra studying outside of class, but it was still pretty easy. The main thing that was difficult for me was adapting to the format of MCQ questions. I would estimate that ~20 of the 60 students taking the equivalent class were at the exam.
The third exam was English Lang, which you don’t really need a class for to study as long as you’re good at English. To quote a senior I know when inquiring about the test, “I didn’t study and left halfway through for a [sport] game, and I still got a 4.” ~60 people took it (230 juniors)
I know that, for instance, knowledge based classes that can go in wildly different directions like US History and Biology require lot of extra studying, so many people don’t take them (that’s why I didn’t do APUSH). Those who take them do quite well, though; I was just too busy to put that on my plate.
I also was speaking to two seniors (both Ivy-bound) about APs; both of them took three APs during their entire high school career, so I imagine that it’s not entirely uncommon to take very few.
Certainly not here.
Probably not; standardization seems to generally be the name of the game. It’s also a fairly easy way for less resourced schools to offer high level courses to their students, so why not?
I’ve always found it funny that Exeter, Andover, and Lawrenceville, the three schools that participated in the study that originally spawned APs, were some of the first three to drop them.