Preschool education, high school, university stage. Non-compulsory education refers to the education that all school-age children and adolescents must receive. Non-compulsory education is aimed at compulsory education, which belongs to compulsory education in primary and junior high schools in China and is free of tuition. Other stages except primary school and junior high school belong to non-compulsory education. Among them, high school belongs to non-compulsory education, and the premise of attending high school is to complete junior high school education, and then choose a school by virtue of the results of the senior high school entrance examination; Therefore, preschool education, high schools and universities are all non-compulsory education.