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Pass your CDL knowledge test on the first try.
Real exam-style practice across all 8 endorsements, with detailed answer explanations sourced from the federal CDL Manual. 410+ questions. Free, forever.
- 410+Practice questions
- 50U.S. states
- 8Endorsements
Manual-aligned
Pick an endorsement and start drilling.
Each test pulls real-style questions straight from the federal CDL knowledge pool with full written explanations. Track your score live.
General Knowledge
The foundational CDL exam covering inspection, safe operation, and federal regulation.
ABAir Brakes
Required to remove the L restriction and operate any vehicle with air brakes.
CVCombination Vehicles
Required to drive any tractor-trailer or other combination of two or more vehicles.
HHazardous Materials
Required to transport materials that require placards under federal Hazardous Materials Regulations.
NTanker
Required to drive a vehicle hauling a bulk liquid or gas in a tank of 1,000 gallons or more.
TDoubles & Triples
Required to pull double or triple trailer combinations on a Class A CDL.
PPassenger Transport
Required to drive a vehicle designed to transport 16 or more passengers (including the driver).
SSchool Bus
Required to drive a school bus that transports students from home to school and back.
Looking for your state's CDL rules?
Fees, medical card requirements, endorsement add-on rules, and disqualification policies for every U.S. state.
Built by people who actually read the federal CDL Manual.
Every practice question on CDL Prep Hub maps to a specific subject area in the AAMVA Commercial Driver License Manual — the model curriculum used by all 50 U.S. states. We re-verify content against the current edition every quarter.
If you find a question you believe is wrong or out of date, send us a note. We rewrite, we re-source, and we publish corrections in the open.
Read our editorial standards- Aligned to the federal CDL Manual. Not a knock-off question dump.
- Detailed explanations. Every answer comes with a written rationale, not a one-liner.
- State-specific guidance. Federal core plus state-specific fees, scheduling, and rules.
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Latest from the study guide
Plain-English explainers for the topics most CDL applicants get wrong.