Which civil law does the school think is that children behave abnormally and let parents sign an exemption agreement?

Article 1 199. According to Article 1 199 of the Civil Law, if a person without civil capacity suffers personal injury during his study and life in a kindergarten, school or other educational institution, the kindergarten, school or other educational institution shall bear the tort liability; However, those who can prove that they have fulfilled their educational management responsibilities will not bear tort liability.