Actually, it's easy to untie. Just log on to the safety education platform, click on mine, and click Unbind Account.
If you want to rebind, after entering the official WeChat account, click "Public Service" in the menu bar to enter the Sichuan Education Management Service Platform; Click here to log in and select "Register New User"; Click "bind identity", select "I am a student (parent)" and enter the "binding code" notified by the school to complete the identity binding; After entering the system, select the "Student Registration" function in "My Application"; Just verify and correct the student's personal information.