AP Chem is a challenge, but it's a lot easier if you read your notes/textbook/test prep book for an hour each night. Do plenty of practice problems and study with an "active mind" (for lack of a better phrase). It takes more than moving your eyes across the paper - think about what you've read and try to paraphrase it. This is a good way to practice for the AP tests in May. If you are the kind of person that studies well with others, try to form a study group. This is what I've done for a couple AP classes and we help each other out a LOT. Not to sound all controlling, lol, I'm just telling you from experience.
I'm taking 5 APs next year, BTW. >_<