At present, star mathematics is mainly aimed at children aged 3- 10. Taking preschool as an example, three stages, A, B and C, respectively correspond to kindergarten primary, middle and large classes. Each big stage is divided into four small stages, each small stage needs 12 class hours, and it takes 1 year to complete a big class. The staff also revealed that they will finish Class C4 before May to facilitate young students to attend the interview in a small private primary school in May.