1. There is a time limit for revoking the punishment. Warning for one year, severe warning for one and a half years. This time limit varies from school to school, depending on how your school stipulates it. As long as the punishment time is up, you can write an application to cancel the punishment. Write an application with sincerity and try to be perfect, and then give it to your class teacher or counselor for signature. After signing, go to the dean's office and sign it, and then give you a form to fill out. 3. Take the completed form to the hospital, stamp and sign it. After the formalities are completed, a notice of cancellation of punishment will be sent to you, so that your punishment will be gone.