What is the ruling on disobeying teachers' orders and leaving school before the end of the school day, knowing that the school is mixed and cannot be changed?

It is not permissible to disobey teachers, male or female, if they command obedience to Allah. However, it is obligatory to disobey them if they command disobedience to Him. It is also not permissible to leave school before the end of the school day except with its permission, because it violates the rules stipulated by the school. Violating these rules leads to self-abasement and exposure to punishment, and a Muslim should not abase himself.