1, "key points" can lay a solid foundation, and the chapters inside are also arranged according to the content of the textbook. It is full of useful knowledge points, very detailed.

2, you can use it to preview, do problems in advance, and the teacher will do after-school exercises after class, so that you can master the knowledge points that are not too difficult.

3. The knowledge points are comprehensive and the questions are novel. Books are printed in color, and the colors of various graphic structures are different, so you can see them clearly, and each chapter has knowledge to sort out.