Legal analysis: compulsory education cannot be expelled, but high school is not compulsory education. High school for three years, because it does not belong to the limited scope of the current national compulsory education, the school has the right to persuade students to leave. You can complain to the local education department and deal with it through consultation, but the school's practice is not necessarily illegal and needs to be handled in accordance with the school's rules and regulations.

Legal basis: Article 19 of the Education Law of the People's Republic of China. The state implements a nine-year compulsory education system. People's governments at all levels take various measures to ensure that school-age children and adolescents enter school. Parents or other guardians of school-age children and adolescents, as well as relevant social organizations and individuals, have the obligation to enable school-age children and adolescents to receive and complete compulsory education for a specified number of years.