Is it useful to buy famous mathematics books in senior one?
I don't think it's necessary. After all, the topic on the inscription is still much more difficult. You have a poor foundation, so I don't advise you to do it directly. You can buy some reference books, explain them, understand them first, and then do the questions. I think a set of books in Longmen is very good. I read that book at that time. You can go and have a look. Wish you success!