Peng: okay, I'd just like to comment that it is not the teacher's responsibility to motivate a class. It is his responsibility to facilitate learning, which he may have failed to do, but not provide your drive. If you are in an AP class and are not self-motivated, you are going to fail the test on your own merit.
However, back to the subject. sarnis, I think you should try this... Go about the test as though your teacher just gave your the ability to take a cheat sheet into the test with you. Actually make a sheet of all the formulas you are most afraid will come up or that you are not sure of. Then, once that is made, study that sheet and make sure you can use any of them just from memory (what each symbol means, the units, the formula itself).
The whole process of making the cumulative cheat sheet will get you thinking about your strengths and weaknesses so that you can address them for the test. Also, it usually doesn't take to long to deal with and makes the whole process a lot less intimidating. And of course, if any of those formulas give your problems, you will be able to come onto this board and get help with that specific question!