1. Pay attention in class. As it is being explained try to understand it. If you don't understand it ask questions, that's what your teacher is there for.
2. Read through the material again when you get home, then do questions from the textbook. If you can't do a question bring it in to class the next day, and get the teacher to explain it to you, or post it on BOS. You only need one textbook, because these questions are just to help you understand the material, not to provide practice.
3. The most important step: do past papers. I cannot stress this enough. Do every past paper you can get your hands on. There are so many people who are extremely capable mathematicians who fall down on exam technique, and/or silly errors. Myself I did 60ish past papers for each 3u and 4u, and boosted my ranking from 15th to 2nd in a class of 17.
While most of this should be stating the obvious, hopefully it will avoid future threads asking how to study.