Mathematics class refers to a special class organized by a group of students who are good at mathematics competitions in middle schools. Take Shanghai as an example, four famous schools (Shanghai Middle School, Fudan Middle School, No.2 Middle School Attached to China Normal University, and Jiaotong University Middle School) have held such classes. The original math class was a temporary class. Members were selected from the top students in various schools and concentrated on participating in the math competition training in designated schools. After the training, the students returned to their original schools.