It depends on whether the school has written this article into the school rules and regulations. If this article is written into the rules and regulations, according to the first paragraph of Article 29 of the Education Law of the People's Republic of China, the school will manage itself according to the articles of association; Paragraph 4 of Article 29 stipulates: (Schools have the right) to manage and reward and punish students' school status; Paragraph 4 of Article 44 stipulates that an educated person shall fulfill the following obligations ... and abide by the management system of his school or other educational institution. According to the above three laws, as long as the school writes it into the rules and regulations, the school can handle it according to the rules and regulations, which is completely legal.

If what you said is not written into the rules and regulations, it is illegal for students to miss classes and deduct credits because they didn't attend classes. According to the fourth paragraph of Article 43 of the Teacher Law of People's Republic of China (PRC), the educated have the following rights ... If they are not satisfied with the punishment given by the school, they shall appeal to the relevant departments; If a school or teacher infringes upon his personal rights, property rights and other legal rights, he shall lodge a complaint or bring a lawsuit according to law; And the provisions of Article 83: Whoever violates the provisions of this Law and infringes upon the legitimate rights and interests of teachers, educatees, schools or other educational institutions, causing losses or damages, shall bear civil liability according to law. In this case, it is illegal for the school not to follow the rules and regulations. You can complain to the administrative department of education (Education Department or Education Bureau) and ask for fair treatment. If the circumstances are serious, the school leaders may be held accountable.