Legal analysis: it is illegal to open a cram school without permission. The Education Bureau clearly stipulates that in-service teachers can't make up lessons for students privately during the holidays, which means that they can't run cram schools during the summer vacation.

Legal basis: Article 41 of the Education Law of the People's Republic of China. Employees have the right and obligation to receive vocational training and continuing education according to law. State organs, enterprises, institutions and other social organizations shall provide conditions and convenience for the study and training of their employees.