Changing C2 from 1 to C 1 is a degraded driver's license. You need to bring your ID card and other materials to the vehicle management office to fill in the confirmation letter of demotion.
2. To change from C 1 to C2, you need to bring your driving test certificate and ID card to the local vehicle management office to change the driver's license level.
3. C 1 It should be noted that C2 can't change back to C 1 exam and take C2 driver's license.