First, brush more questions, you can buy exercise books and other required questions to do. Only by brushing more questions can we realize a problem, not knowing how to start. Also, pay attention to examples. Many students think that the examples in the textbook are too simple to be clear at a glance without spending too much time. Actually, this is not right. Only when the examples are thoroughly done can the foundation be solid.
Second, ask more questions to teachers and classmates. If you don't understand, you should ask for leave from others in time, whether it is a teacher or a classmate. Don't pile up problems that you can't do, and in the end, you will only pile up more and more, which will make you feel at a loss.
Third, sort out the wrong questions, sort out the wrong questions, do you want to take a look again, think about the reasons for the original mistakes, and avoid repeating the same mistakes.