Your English 100 is good now, and your basic knowledge is ok. You don't need to pay special attention to grammar if you want to get points. What you should focus on now is the amount of reading and the number of words. Keep a certain amount of reading and recite words every day. These are the keys to giving you extra points. If you don't have enough time to digest, I suggest you don't delve into grammar books, because grammar books are generally boring. Unless you want to be a teacher in the future, you should buy a grammar book to study. Otherwise, it is not necessary. It may be difficult for high school students to read grammar books like Zhang Daozhen or Bo Bing. It is better to spend more time on English reading and writing. I suggest that when dealing with grammar problems, we should contact grammar practice more, think more, and consult teachers more, so that the effect may be better. After all, the college entrance examination examines whether you can use grammar in actual situations, not how many grammar rules you can remember. So relatively speaking, doing problems can help you better understand the meaning of grammar. I hope these suggestions are helpful to you.