First of all, teaching materials, no matter what level you are now, the foundation must be there. Although you passed the exam organized by the school, did you miss any knowledge points, or did you understand the foundation of the postgraduate entrance examination, and so on. The questions behind the textbook need to be read again more or less, and most of the basic questions are related to the textbook. Familiar with the textbook, you can get close contact with the exam question bank, and your confidence is more clear.
After that, it is a simple exercise. I will repeat the math problems of freshman, find my own review materials and so on. Have a general basic concept and then look at what you don't understand. After eating the book thoroughly, it is easy to move on to the next step. Besides, it depends on your age. Junior year is relatively easy to start. If it is in the future, you should arrange a more compact study plan for yourself.
Brushing questions, reviewing books and watching online classes are all ways to learn and progress, especially brushing questions is always a success. Brush up the topics arranged on the internet, buy some review materials at the back, study more, and it will be easy to learn math. Watching online classes is also a better way. No matter at which stage, you can talk about some questions you don't know in detail. However, online courses are slow and need more time. If you want to take the postgraduate entrance examination, you should make plans early.