If you don't ask for leave and go through the formalities of suspension, theoretically, the school can indeed expel you. The basis is that absenteeism will be punished accordingly, from low to high, from warning punishment, serious warning punishment, demerit punishment, detention and probation punishment to final expulsion. But generally speaking, schools are more humane, and the common practice is to drop out directly. Because automatic withdrawal is not a punishment that is not recorded in the file, expulsion is a punishment that should be recorded in the file.

I don't know what caused the school to implement the punishment regulations mercilessly. My guess is that you didn't go through the corresponding formalities according to the regulations and didn't communicate well with the school. I hope you can negotiate with the school if possible. It is inevitable to leave school for today. You want the school to let you drop out of school automatically. Now that the initiative is in the hands of the school, you'd better have a better attitude and need to discuss it with the school. Good luck.