Math exams must be arranged. Choose and fill in the blanks in the first 40 minutes. No matter when it's over, put it down first and concentrate on the answers at the back. Sometimes there will be progress at the beginning of the exam, and after the big questions are finished, the previous questions are also enlightening. A large part of junior high school math test questions are deformed or extended from textbook examples, so the most basic thing is to thoroughly understand every example and complete textbook exercises to understand math subjects. You have to do exercises, but you have to have skills. How much is not the key. The key is to know a problem by doing it. You must ask the teacher to find out what you can't do and make sure that you won't make mistakes when you meet the same type next time. You just do 10 exercises, which are similar in type, and it's useless to do them. I can only repeat my work. Personally, I am lazy. My problems are limited, but I will meet them. There is nothing wrong with your math, thinking is the most important thing. Mathematics should not be memorized by rote (but formulas and theorems should be memorized on the premise of understanding). You should learn to use the formulas and theorems you have learned to solve your problems. I hope it helps you.

PS: These are all my experiences in learning mathematics. I am a science student and got 125 in the college entrance examination.