One needs to prepare himself for his exams because this is the final stage where you will be judged on what you did the whole year. You need to make sure that you have all the notes and handouts so that you can study before hand.
But if your exams are just round the corner and you don’t know what to do so all you need to do is take updates from a friend who can guide you with the important topics and then you can prepare quickly and jot down the important things that are required and go through them quickly. In this way you will be able to go through all you want and won't even fail in the exams.