(People's Education Edition) There are 5 compulsory mathematics books for Senior One, from compulsory 1 to compulsory 5. Generally, there are two books a semester. As for which two books to attend, each school is different! You'd better ask the school teacher ~ as for the study materials, I suggest buying a set. Basically, I can read a whole set of materials, and I have basically learned mathematics. The rest depends on finding a test paper to practice.