The exercises in the book are the foundation. If you can't do all the exercises in the book, don't expect you to get high marks.

But the questions at the back of the book have been deeply impressed before, so they are of little use, because even if you don't understand some questions thoroughly, you may get answers with a little impression before.

So at this time, the teacher's role is reflected, and the exercises given by the teacher help you review.

But the problem came out again. Teachers are not omnipotent. The quality of the teacher determines his review level. In addition, each student's knowledge is different, and teachers can't cover everything.

I suggest you buy a comprehensive and basic review book. After all, the books written by a team of others will certainly not be bad, and then you will do the teacher's review questions. You should choose the key points and the difficulties you think.

The basic things are often simple. Many things often know how to do or even know the answer at a glance, but they can't just pass by. Even if you don't do it all, you have to take some. As the saying goes, practice makes perfect. Do more basic things, and your mental arithmetic ability will be improved. On the contrary, if you don't do it, you will have a bad habit of arrogance. For the first round, this is absolutely impossible. But in the third round, that's it. Time is not enough, you should choose to review.