There are various methods of studying for exams. people vary here not everyone studies the same way. I guess it also depends on a student and their level of understanding. There are those who find it easier to just read through material and they are okay, and there are those who would rather write down everything that they read and memorize it, either way you can study and pass your exams. If you are those students who listen when a teacher is teaching and you grasp everything you are lucky because that wouldn't require you to read much, but if it is the other way round, then you sit in a quiet room, no distractions, switch off your phone, tv or radio. You should be sitting at a table that has good lighting so that you don't strain. The chair should also be comfortable to avoid any kind of distraction. Try to focus on one subject at a time, don't do two or three subjects at a go, that will confuse you. Read and write down any point that catches your attention, and go over it once you are done writing, that will enable you to understand better. Do not go over your books again on the exam day you will get yourself more confused stick to what you read the previous day. Just take the time to relax and wait for the paper. all the best.