I took AP math in grades 10-12.
In grade 12 though, the teacher was an 80-something year old man from Albania, he expected us to learn everything from the textbook ourselves at home. In class we just sat, talked, and drank tea everyday.
His tests were always super long, so he let us take them with us over lunch to finish, so everyone found the answers in the textbook
I didn't know anything by the end, and failed the exam but he ignored it and gave everyone an A because he liked us as a class.
I got a score of 1 on the official AP Math test though, oh well