All year round. According to the query learning network, one or two volumes are needed for senior one study, and one or two volumes are optional for senior two study. The teaching plan of each school is different, and the learning order may be different, but one thing is certain: the compulsory mathematics of Beijing Normal University needs to be studied all year round. Senior high school mathematics textbook published by Beijing Normal University Press, approved by the Ministry of Education on 20 19. Among them, the compulsory textbooks are divided into two volumes, the first volume and the second volume, and the elective textbooks are divided into two volumes.