CDL Practice Tests, Exam Simulator & Study Guides

CDL Prep Hub helps you pass your commercial driver's license (CDL) knowledge test the first time. Study 484 real-style practice questions with a plain-English explanation on every answer, take a timed exam simulator, and review concise study guides — for all 50 states, no sign-up required.

Choose your CDL practice test

• CDL General Knowledge Practice Test — required for every CDL (109 questions)
• CDL Air Brakes Practice Test — for vehicles with air brakes (89 questions)
• CDL Combination Vehicles Practice Test — for Class A tractor-trailers (64 questions)
• CDL Hazmat Practice Test — hazardous materials endorsement (50 questions)
• CDL Tanker Practice Test — tank vehicle endorsement (43 questions)
• CDL Doubles/Triples Practice Test — multiple-trailer endorsement (44 questions)
• CDL Passenger Practice Test — bus/passenger endorsement (43 questions)
• CDL School Bus Practice Test — school bus endorsement (42 questions)

Take the timed CDL exam simulator · Read the study guides · FAQ

Study material based on the official CDL manual. Not the official state exam — always review your state's CDL handbook before testing.