I make some Math lessons... I suggest you to study during the time in which your concentration is the better of all the day. It's dangerous to study 3-4 hours math when your brain don't reply when you want. It's better to study 1 hour, but with "quality study"

1) Look at your textbook chapter. Turn it over page by page, looking at the chapter headings. There will be some places where you feel good and others that make you feel bad. Shore up your weak spots. Pick one topic you HALF-know and study that one small topic until you feel good about it. Maybe you don't have time to learn everything, but at least you will go into the exam feeling that you know ONE more thing. 2) Study in such a way that you get the feeling of mastery. There is nothing in there you cannot learn. Life is tough and maybe they've given you too much to learn in too little time, but nothing in there is "too hard" or "too complicated." 3) Pick something you've studied and are still can't understand. While there is time, before the exam, GO TO YOUR TEACHER and ask a question about it. Say "I need some extra help with factoring expressions" and show your teacher some specific problems you can't solve. What's the worst that can happen? Remember, your teachers are not your enemy. They WANT you succeed.

But you're Chinese! You're supposed to be good at math by default! =D