In this case, let's talk about the teacher first. According to the Law of People's Republic of China (PRC) on the Protection of Minors, teachers are not allowed to impose corporal punishment on students. Moreover, according to the provisions of the Criminal Law of People's Republic of China (PRC), beating your teachers and classmates constitutes a crime of intentional injury, and you have to bear criminal responsibility and a lot of civil compensation.
I suggest: bring a lawsuit to the people's court, demand that they be investigated for criminal responsibility, and demand that the Ministry of Education expel teachers from public office and dismiss them.