I am a quasi-senior one, and I have finished the compulsory one of mathematics and physics in senior high school by myself. I bought this book and made it on May 3rd. I find it a little difficult. Do you have any basic questions? I recommend it. Hello. Do more basic questions and don't brush difficult ones. You haven't learned it in high school. It's not necessary. All the above problems can be solved by making some teaching materials, but that kind of book is more expensive. You can also find it online. Don't just brush hard. You know, just keep it simple. You will learn quickly after school starts.