What are you going to study?
My advice is to do as many practice problems as you can. Do them as soon as you can. Try to get your hands on tests from previous years and mock tests and do them as if they were real. Practice solving problems. It really is the most important thing to do. If the exam/test does not involve problem solving but reciting theorems and their proofs or something, that's harder, but practice that, recite them to a friend as if you were examined, you get it. Practice, practice, practice.
Don't let the deadlines throw you off. The first half of the semester is usually easy and people usually slack off during it and then can't cope with all the assignments that are due to the second half. Try doing everything as soon as you can. It actually helps a lot to know that you have already done something and you don't have to worry about it. This is pretty hard, but do your best, if there's some course that you particularly enjoy exploit that and get done with it as soon as you can so when the panic from multiple deadlines arrives at least you don't have to worry about that one.