1. There are many examples of refusing to stay because of delayed attendance when returning to China for medical treatment. It seems that the Immigration Bureau lacks confidence in the reasons why China students return to China for medical treatment. Therefore, if there are too many absentees, it may be tragic. Please be mentally prepared.
2. In addition, if you have a good relationship with the school, it is still possible for the school to send a notice and agree to continue your studies or be admitted to other schools. If the school doesn't give you a certificate, it will be very troublesome.
But in any case, if you need to renew your stay after the expiration, you must apply before the expiration, otherwise, even if you have sufficient reasons, it will not be extended after the expiration. Need special attention.
As you said, medical records and notarial certificates have little effect. The key is your attendance record at school. It is even more troublesome if you are a student of a language school or other subjects.
5, give it a try, don't entrust the administrative clerk to help you consult.
-Non-experts