Legal analysis: not illegal, just illegal. Moreover, it is necessary to apply for the qualification certificate of the education department to participate in make-up classes, and starting teaching without a license is not within the scope of illegal business. The establishment of schools or other educational institutions in violation of the relevant provisions of the state shall be revoked by the administrative department of education or other relevant administrative departments. Paid remedial classes have always been one of the difficult problems in China's educational governance. Although the Ministry of Education and other ministries and commissions have begun to introduce a number of norms from the aspects of reducing students' burden, quality education, building professional ethics and standardizing fees, the problem of making up lessons has not been effectively managed. There are three situations in which primary and secondary schools constitute paid remedial classes: first, organize and require students to participate in paid remedial classes; Second, make up lessons jointly with off-campus training institutions; Third, provide education and teaching facilities or student information for off-campus training institutions to make up lessons. There are also three kinds of paid remedial classes for in-service primary and secondary school teachers: one is to organize, recommend and induce students to participate in paid remedial classes inside and outside the school; The second is to participate in paid remedial classes organized by off-campus training institutions or other teachers, parents and parent committees; Third, introduce students and provide relevant information for off-campus training institutions.

Legal basis: Article 75 of the Education Law of the People's Republic of China violates the relevant provisions of the state and establishes schools or other educational institutions, which shall be revoked by the education administrative department or other relevant administrative departments; Illegal income, confiscate the illegal income; The directly responsible person in charge and other directly responsible personnel shall be punished according to law.