This mainly depends on the usual accumulation. The basic problems of math problems themselves are those. After a thorough understanding of those questions, you basically have the general idea of doing them, and the rest is the details. Also, if you don't have any ideas after reading the questions, or if you find that your thinking is wrong and you can't think of other methods for the time being, then skip doing other questions first, because doing other questions is likely to inspire the previous questions. As for checking, if time is tight, it is not necessary to check the whole paper (if time is enough, it is necessary). There are two key points to pay attention to: one is the simplest question, which can be worked out at once; There is also the most difficult problem, the kind I worked out with great difficulty (generally, this kind of problem is very exciting and easy to make mistakes as soon as it is worked out). These are some of my previous experiences. Please refer to it and see if it is useful.