Every platform has his account, such as mileage and mileage. But summing up Zhihu's answer, most people said it was useless and the price was not friendly to students. I don't know exactly how to do it.

How to learn math well: Before the teacher gives a new lesson, get a general idea of what the teacher is going to say in class. The knowledge points you don't understand in the preview are marked with a pen, and you can get twice the result with half the effort by listening carefully in class.

Follow the teacher's thinking, and you should finish the homework assigned by the teacher carefully and independently every day. If not, you can ask a good classmate or a teacher.

Prepare the wrong question book and form the good habit of remembering the wrong question. When the wrong questions are recorded in the wrong book, think about the knowledge points involved in the questions and the reasons for the mistakes, and then do a lot of calculation exercises every day to improve the calculation ability.