CDL Practice Tests
Free practice tests for your Commercial Driver License, from the core General Knowledge exam to every endorsement. Each test has explanations and saves your weak areas. No account needed.
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Take the full CDL practice test
A mixed quiz across general knowledge and every endorsement. The fastest way to check your overall readiness.
General Knowledge
The core knowledge test every CDL applicant must pass, covering safe driving, vehicle inspection, control, and hazards.
Required for every CDL applicant (Class A, B, and C).
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Air Brakes
Covers the air brake system, proper use, and inspection. Skipping it adds an "air brake" restriction to your license.
Needed by nearly all Class A and most Class B drivers.
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Combination Vehicles
Coupling and uncoupling, off-tracking, and safely driving tractor-trailers and other combination vehicles.
Required for every Class A (tractor-trailer) applicant.
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HazMat (H)
Hazardous materials rules: placarding, loading, security plans, and emergency response. Requires a federal background check.
Drivers hauling placarded hazardous materials.
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Passenger (P)
Safe loading and transport of passengers, including buses, shuttles, and motorcoaches.
Bus, transit, and shuttle drivers.
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School Bus (S)
Loading and unloading students, danger zones, emergency evacuation, and railroad crossing procedures.
School bus drivers (requires the Passenger endorsement first).
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Tanker (N)
Handling liquid surge, high center of gravity, and safe driving of tank vehicles.
Drivers of liquid or gas tank vehicles.
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Doubles/Triples (T)
Coupling and inspecting double and triple trailers, and managing their unique handling and rollover risks.
Drivers pulling double or triple trailers.
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Pre-Trip Inspection
What to check before driving, organized by system, so you can complete the inspection portion of the skills test.
Every applicant performs a pre-trip inspection for the skills test.
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How CDL testing works
Getting a Commercial Driver License starts with the written knowledge tests, then a skills test in the vehicle you intend to drive. Everyone passes the General Knowledge test first. From there, the endorsements you add depend on what and whom you will haul: combination vehicles and air brakes for most tractor-trailers, passenger and school bus for buses, HazMat for placarded loads, and tanker or doubles/triples for those specific rigs. Because the knowledge tests come from the federal Commercial Driver License Manual, what you study here applies in every state, with only minor local differences in fees and scheduling.
How to use these practice tests
Start with the General Knowledge test and work in practice mode, where every answer comes with an explanation. Once you are scoring above the pass mark, switch to the exam simulator to rehearse under the real test length and time. After each attempt, the topic breakdown shows which areas to review, and your progress saves automatically so you can pick up where you left off.
CDL practice test FAQ
What is on the CDL test?
Every CDL applicant takes the General Knowledge test. Depending on the vehicle and job, you may also take endorsement tests: air brakes, combination vehicles, HazMat, passenger, school bus, tanker, and doubles/triples, plus a pre-trip inspection and skills test.
Are CDL tests the same in every state?
The knowledge content is federal, drawn from the AAMVA/FMCSA model Commercial Driver License Manual, so it is nearly identical across states. Fees, scheduling, and a few rules vary, so confirm details with your state CDL manual.
Which CDL endorsements do I need?
It depends on what you will drive. Tractor-trailer drivers need combination vehicles and usually air brakes; bus drivers need passenger (and school bus for school buses); HazMat is for placarded loads; tanker and doubles/triples are for those specific vehicles.
Is this CDL practice really free?
Yes, completely free with no account required. Your scores and weak areas save privately in your browser so you can track progress across sessions.