What are the requirements for obtaining a C1 license with a D license?

[DeEverett]

You should not have accumulated 12 penalty points in the current scoring cycle and the most recent scoring cycle prior to the application. You can apply for the D to C1 license upgrade test at the issuing location of your current motor vehicle driver's license. Below are the regulations regarding driver's license upgrades: 1. Special vehicle scheduling time: For applying for low-speed trucks, tricycles, wheeled self-propelled machinery, trolleybuses, or tram driving license categories, schedule the test at least 20 days after obtaining the learning driving permit. 2. Small vehicle scheduling time: For applying for small cars, small automatic transmission cars, or small automatic transmission passenger cars for the disabled driving license categories, schedule the test at least 30 days after obtaining the learning driving permit. 3. Large vehicle scheduling time: For applying for large buses, tractors, city buses, medium buses, or large trucks driving license categories, schedule the test at least 40 days after obtaining the learning driving permit.