It doesn't cost money. Basically, students can't choose which math to take, but only arts and sciences. Which book to choose is up to the school.

But you can buy books to teach yourself. High school will be divided into arts and sciences.

But basically, the textbook knowledge of science has covered the liberal arts.

There are too many elective courses in high school, many of which involve college knowledge, so it will be very difficult to learn!

If you don't understand anything, you can continue to ask and hope to adopt it!