It is difficult to combine the after-class questions, and the purpose of doing them is to grasp the basic concepts more firmly. Math exams are always like this, and the basic theorems and concepts are "grids". One-year postgraduate entrance examination is a Lagrange proof problem and an example of a textbook. Many counseling books have no proof process. Facts have proved that textbooks are really important.

In addition, math review must be re-planned, and how many pages of books you want to read every day must be implemented, otherwise it is easy to be too late and have a psychological breakdown.

It's not particularly difficult to count to three. Of course, you can review well. Come on!