If your grades are excellent, you can basically put down your textbooks, find some exercises, papers, big questions and more difficult questions, do them for him, and then explain them. Of course, it is best to have a plan and a classification. It is best to give him a summary and say that this kind of problem can be done.
If it is intermediate, it is necessary to combine textbook knowledge and do some after-school exercises while explaining. Let him consolidate some knowledge that should be consolidated. At least it's an example or something.
If it's poor, don't ask too much. Give him the examples in the textbook directly, let him understand, and then the exercises after class can be completed, and basically it will be fine.
Of course, in fact, I think that tutoring is mainly to understand what the child is like, which aspect he is weak, and whether he is "drugging".
As for the key points, in fact, the examples in the textbook, at least those need to be mastered and used.