What these guys said, pay attention in class and ask questions if your unclear. Make notes for yourself in class, you won't be able to use your notes but it helps you remember and you can use it to study before you write the test. If your aware of what your doing the test isn't hard. Read the questions twice before looking for the answer.
When you do the practical take your time, watch the barrel direction. Don't point at the instructor :O
Good Luck, make sure you come back and brag about passing!