First of all, you should be familiar with the content of the textbook, remember it, and basically don't need to read books after you figure it out. Then practice more questions. Because it is a competition, we have to delve into several big questions every day. It would certainly be better if we had a tutor. If not, think about the question first and then look at the answer. Do this problem next time and see if you can do it. Until we can do it, we will do the next question. Just ask a few questions every day, not many, but you should understand everything you do. Then proper rest is essential, so as to keep your brain awake and think quickly. This is my own experience and understanding, I hope I can help you. Typing on a mobile phone is not easy! )