Write it three times and you'll be fine. When you get there, you don't have to look at it anymore. In fact, doing it repeatedly is the key. The first time, learn how to solve the problem thoroughly, what is the overall idea and how to write each step. After learning, do it seriously. After making sure that you have fully learned, put it down for the time being. Do it again in three days to see if it can be done completely. If you can, you have learned it. If you can't, you have to learn again. Then wait for another three days, and then write it silently, and you can still work it out completely. This is the real meeting. Don't look at this question any more. After learning the wrong question, it is not wrong. So this is a step-by-step learning, and it is enough to write it down three times.