If you can't withdraw it, there's nothing you can do. After all, this application should be reported to the local education commission, which is very troublesome to change.

The application for repeating a grade in a university is also approved by the relevant leading teachers of the school. If you don't want to repeat the grade now, please find the relevant school leaders to reflect the problem and explain your current thoughts. I believe the school leaders will consider it as appropriate and give you a satisfactory answer after accepting your application.