im in ap calculus ab right now, and i think i can say that my teacher intentionally makes the course harder than other ap calc ab classes in other schools. The problems she puts on tests and take home assignments are really hard, and are way different and more difficult than the textbook problems. On several occasions, ive asked my friends from other schools taking or have taken calc ab/bc to help me on take home problems, and many times they were "this is way harder than what my teacher gives." so,i guess i just got stick with a crazy teacher. However, i know exactly what i can do to ace the class. Im not good at the problems because they are hard, and i just need to practice doing more problems. The thing is, i need to practice problems that are as hard or even harder than my teacher's problems. Ive purchased this book called "schaum's 3000 problems solved in calculus" but that book was way too easy and ineffective for boosting my problem solving skill. I need a supplmental book with really hard problems. It's kind of like my SAT and SAT 2 prep; i bought the books with generally harder questions than the actual test, which were usually barrons. So, to sum it all up, can you guys reccomend me a supplemental problem book with some good, hard problems? thanks btw, she did give some hints at times. She told the class many of the test problems and take home problems are taken directly from an ap calculus test prep book. However, she wont tell us the name. She assured us its not a barrons or princeton review or etc. Shje tells us its an obscure brand in california, and they can only be purchased in bulk.