The second disadvantage is that there is no core of the knowledge test center. Doing more questions will also help.

Disadvantage 3 is more difficult.

However, in general, junior high school mathematics has more problems to do and more problems to see. And according to my experience, don't deliberately arrange time to review, that is to say, you should either do the topic for an hour or an hour today. It depends on your interest in math problems and your pursuit of their depth and difficulty. Be sure to hurry up and do the problem. Check all the questions that you can't do, summarize the wrong questions once a week, and take out the wrong book if you have nothing to do or are tired of doing it. This is how I study. Doing the questions at ordinary times helps you to expand the question bank, reviewing the wrong questions helps you to deepen your understanding, find your own weaknesses, and the most important thing is to think about the methods that are suitable for you to overcome.

I wish you success ~