90 points for the third prize of Mathematics High Union Province. The preliminaries of the Mathematical League are held by the provinces themselves, and the preliminaries are held at different times in each province. Through the selection of the preliminaries, the candidates are eligible to participate in the league. After the candidates are qualified, they will register according to the league notice issued by the provincial mathematical associations. Generally, coaches or middle schools organize the registration in a unified way, and the provincial mathematics association will determine the entry list. All provincial teams are selected by the Mathematical Union and participate in the China Mathematical Olympics in a unified way.