Math is very simple. Read the book carefully, study the exercises at the back of the book, and straighten out the connection of knowledge. I think it only takes three days, and it's easy to take a short time every day and review what I read in front every time.

In physics, the content of compulsory one is easier to understand. It is recommended to use it for 5 days, not necessarily continuously (preferably not continuously), because some knowledge points need to spend more time thinking, and the longer you think, the better you understand. Then it is suggested to do the basic part of Longmen Special Physical Mechanics 1 this book, and study it a little, but it will not be solved until the beginning of school. It should be regarded as a relatively solid and comprehensive study.

Chemical requirements 1 water explosion ... > < ...

First of all, we should understand several basic concepts (such as the amount of material) different from junior high school. Then, it is important to know some elements and remember the equations well. It is suggested to study Wang Houxiong's Handbook of Important and Difficult Points, which is a very good book.