I've only got one in 10th grade, and AP world is more an experimental elective that we're just making up as we go than a real class. AP English is offered in 11th and 12th grade only, same with history, those classes being US history part 2 in 11th grade (basically everything beyond the reconstruction efforts after the civil war up until the cold war), and government/economics in 12th grade. AP chem and Physics can't be taken before 11th grade, and AP calc and AP stat require you to have gotten through precalc first, which is scheduled as an 11th grade course. You can double math classes if you want, which I did last year as a freshmen, but there are only 8 classes I can take throughout the whole year, and at least 6 of them are set in stone and cannot be changed, so I don't have a lot of wiggle room to take AP courses. I tried to take AP psychology too, but juniors and seniors get precedence over little sophomore me, so I got bumped from that. I only really got into AP world because it was such a small group even before all the dropouts, so I'm there because nobody else wants to be. In reality the only way for a 10th grader to take AP courses is to get essentially 2 years ahead in math courses, and take AP calc and AP stat sophomore year, as some of my asian supernerd friends are doing.