CDL Practice Tests
Prepare for your Commercial Driver's License exam with 130+ practice questions across 6 categories. Each question includes detailed explanations to help you understand the material — not just memorize answers.
Study aid only. StudyItAll is not affiliated with any DMV or state agency, and this is not official test material. Question content follows the federally standardized FMCSA knowledge topics — always confirm details in your state's official CDL manual.
Exam Mode
CDL Pro · $19 once50 random questions · 60-minute timer · 80% to pass — the closest thing to test day.
Audio Study Guides
FreeListen to all six topics hands-free — study between loads or on a break. No app, no download.
Choose a Test Category
Visual Study Guides
Reference diagrams to help you study key CDL concepts.
Truck Inspection Points
Engine Compartment
Oil level, coolant, belts, hoses, leaks
Cab / Controls
Gauges, mirrors, steering play, wipers, horn
Headlights & Signals
All lights working, clean, proper color
Tires & Wheels
Tread depth (4/32 front, 2/32 others), inflation, lug nuts
Brakes
Drums, pads, hoses, slack adjusters, air lines
Exhaust System
Securely mounted, no leaks, not near wiring
Coupling / 5th Wheel
Kingpin locked, platform secure, air/electric lines
Cargo / Trailer
Load secured, doors latched, placards if hazmat
Rear of Vehicle
Tail lights, reflectors, mud flaps, ICC bumper
Air Brake System Flow
HazMat Placard Classes
Road Sign Shapes
CDL Exam Tips
Passing Score
You need 80% or higher to pass each section of the CDL knowledge test.
Study Strategy
Focus on one category at a time. Review explanations for every wrong answer.
Air Brakes Endorsement
If you don't pass the Air Brakes test, you'll receive a restriction on your CDL.
HazMat Endorsement
The HazMat endorsement requires a separate TSA background check and fingerprinting.
Pre-Trip Inspection
Many states require a hands-on vehicle inspection as part of the CDL skills test.
Test Day
Bring two forms of ID, your medical certificate, and any required fees. Arrive early.