If it is a school-based headquarters, the management is not strict and you can enter and leave freely. If you go to self-study, you can teach in the first and third districts, and the time is very abundant, from morning to 9 pm; Changqing campus is very strict. When you pass the doorman, you usually have to show your identification. The teaching building can be turned off in area A, area B and area C at night 10.