Secondly, to understand knowledge points, math problems are not random, but processed according to knowledge points. Some math problems may contain several knowledge points, as long as you can use them flexibly. Do more questions about the types you can't do, and write them down in your favorite way. Whenever possible.
Then, be careful when you do the questions and look at them carefully. If you are wrong or miss it, just change your meaning.
Finally, there is the problem of attending classes. There are some things that are not in books, and there are some methods and techniques. The teacher added it himself. It must be useful. Ask your classmates and teachers if you don't understand.
This should be practiced frequently. Don't be careless Check again when you're done. You think you are right. It is not tiring to check more.