The General Knowledge test is the written exam you must pass before earning your Commercial Learner's Permit (CLP). Take a free, state-specific practice test based on your state's official CDL manual.
The General Knowledge test is the written exam that all commercial driver's license applicants must pass — whether you're getting a Class A, Class B, or Class C CDL. It's the first step in the licensing process: you pass the written test to earn your CLP, complete ELDT-approved training, and then take your skills test.
The exam is based on the official CDL manual published by your state's DMV or Department of Transportation. While the core content is the same nationwide, each state adds its own rules — speed limits, weight limits, and local regulations — so it's important to practice with questions specific to your state.
Every General Knowledge test draws from the same core topic areas in the CDL manual:
Pick your state for a free practice test with real DMV-style questions, instant feedback, and detailed answer explanations.
Beyond General Knowledge, CDL applicants need endorsement tests for specialized driving. Browse the full library:
It's the written exam every CDL applicant must pass before earning a Commercial Learner's Permit (CLP). It covers safe driving, vehicle inspection, vehicle control, and cargo handling — for all CDL classes.
Typically 50 questions, and most states require an 80% passing score. Exact counts and scores vary by state, so check your state's CDL manual.
Yes — the General Knowledge test is the same for every class. Class A applicants also take an additional Combination Vehicles test.
Yes. Every practice test on CDL Schools USA is free with no registration — real DMV-style questions with instant feedback and explanations.
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