I think if you want to learn mathematics in vocational high schools, you can read these books on advanced mathematics, which will be of great help to them and will also increase your knowledge.

At the beginning, my good friend was a vocational high school student. He wants to learn some math very much. I want to lend him my advanced mathematics and the notes I took at that time to make him feel very happy and eager to learn. I think this is a great thing. I hope he can feel good, so that he can make great progress in the future and make him outstanding among his classmates.