Photoread all your textbooks and all your exercise books daily if you can (every other day is just as effective and even once before the test is better than nothing).
Let your sense of curiosity guide you to area that you feel are weak, and activate those parts of the book by doing some revision exercises. If you quickly discover that you are familar with the method, getting them right and answers flowing, check others to work on since you want to practice what you don't know well. If you know your problems areas follow them up. Give yourself 15 to 20 minutes a day for this kind of review, stay relaxed about it so that the information can come to your mind as needed.
Alex