Every state builds its CDL knowledge tests on the same federal rules (49 CFR Part 383), and you need 80% correct on each test. Practice all eight here, free.
Sources:49 CFR Part 383: Commercial driver’s license standards
80% correct on each knowledge test. The federal rule sets the same pass mark in every state, and our practice tests use it too. 49 CFR 383.135
Everyone takes General Knowledge. Add Air Brakes if your vehicle has air brakes, Combination Vehicles for a Class A license, and one test per endorsement you want. 49 CFR 383.93
No. Nobody may publish the real test questions. We write our own questions from the commercial driver handbook and the federal rules, and every answer names its source.
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