As your prepare for your first onslaught of tests, if you have created possible test questions as you have read assignments and attended class, you should have a stack of 3 x 5 cards. Carry these with you everywhere and test yourself until you get every question right.
If you are having trouble understanding a concept, go to your professor without delay! Adding material day after day to fuzzy thinking, will only hurt you. Your personal interaction with your professor might help you should your grade be borderline.
If your professor offers a review session, go!!! This will give you an idea of what is important and is another form of repetition.