At my high school, you didn't have to take the AP classes to take the tests. You DID have to get the signature of a teacher to say that they thought you were prepared to take the test regardless of whether or not you were in an AP class, though.
I took English lit without taking the AP class and I did fine on it. I took an AP psych class where the teacher taught us nothing -- we spent the entire class watching movies like "Girl, Interrupted." I learned everything on my own the weekend before the test and did fine on that one too.
Basically, if you buy the AP prep books that Princeton Review puts out and read them cover to cover, make a few flashcards and study for a week or so, you could pass almost any AP test (except calc or language tests) without taking the related AP classes.
I did take AP calc and AP Spanish classes, but I didn't take the tests. Most schools have their own placement tests for calc and language, so why waste the money on AP tests when you could just take the university test for free?
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