First of all, if you can't go back to school early, tell the teacher why you can't go back to school early and why. Then let the teacher know the reason, ask for leave and see if the teacher can bend the rules. In this case, yes. If you can't go back to school in advance, it may be because of special reasons to communicate with the teacher and let the teacher understand. You can call the teacher and tell him your present situation. Why don't you go back to school early and tell him that you will have some special circumstances and can't go back to school early? You can use WeChat to send a private message to the teacher.