I wonder if I can revoke the demerit. Each school has different regulations, different operation methods, or a greater relationship with people. You have the ability to delete this thing from the file. In general schools, the warning punishment will be revoked after one year or before graduation, provided that there are no other punishments during the warning punishment period. Failing is indeed related to punishing some schools. The key depends on the situation of your school. I think you'd better take things to the teacher in charge of student affairs in your school.