At present, math books are based on learning periods, with one book for each learning period and two learning periods each semester, which means that senior one has to learn four books.
Generally, all schools take the required course 1 first (this is a function that contains a lot of basic knowledge), and then take other required courses according to the actual situation, but the first four are unchanged. For example, in Beijing, the compulsory courses are 1, 4, 5, 2, and the compulsory course for senior two is 3.
The dependence of 2,3,4,5 is not very great, and the order is controlled by each province and city, not necessarily the order of 1, 2,3,4,5.