Even if you sue the Education Bureau, you need evidence. Otherwise, the education bureau is generally on the side of the school, and parents are only angry. Here are some suggestions for your preparation before you go to the education bureau: video recording is ok. This is evidence. After you get the evidence, call the police first, and the police will file a case first. If he hits someone, he will go to the hospital for forensic identification and hand it over to the public security. Hitting people is a violation of human rights, but he has to get the evidence first, and video recording is also ok. This is evidence. With evidence, he is not afraid to travel all over the world. The key to doing things now is to have evidence. With the development of science and technology, mobile phones can record, preferably video, and send it to the Internet. Widely spread through websites such as Weibo and Renren. Even if the school doesn't care, the principal will protect him, and public opinion will force him to take care of it. If the school doesn't care about the education bureau, that's the only way.

If the above can't be done, then take the following plan: call the teacher and record it secretly. During the call, don't let him know that you are recording before you get the evidence, otherwise he will be very careful and won't miss a word. Remember, otherwise all previous efforts will be in vain. When you make a phone call, be natural, speak slowly, and don't rush for success. Through your pestering, he will slowly say the evidence you want, but he doesn't know that you have got it. After the phone call, you can upload the recorded content of this call to your computer and make several attachments to prevent it from being lost. Leave a mobile phone when you come, and a few copies in the computer in case of emergency. If the Education Bureau doesn't care and goes to the school, you can upload this evidence to the Internet, spread it widely through websites such as Weibo, Tianya and Intranet, and subdue them with public opinion. All in all, this is an era of paying attention to evidence. With the evidence in hand, you are not afraid to travel all over the world. Besides, now that the Internet is so popular, everything can be transparent. I don't believe that he hits people with impunity.