FMCSA / State Driver Licensing Agencies
CDL Class A
Commercial Driver's License Class A Knowledge Test
The knowledge test battery required to earn a commercial learner's permit and Class A CDL — the license needed to drive tractor-trailers and other combination vehicles. Administered by state licensing agencies under federal FMCSA standards.
Full program: 4 decks, 816 cards.
What's on the exam
FMCSA CDL knowledge test standards (49 CFR Part 383)
General Knowledge
40%Vehicle inspection basics · Basic vehicle control · Shifting and managing space · Seeing hazards and communicating · Driving in adverse conditions · Cargo handling and weight distribution
Air Brakes
20%Air brake system components · Dual air brake systems · Inspecting air brake systems · Using air brakes and braking distance · Spring (parking/emergency) brakes
Combination Vehicles
20%Coupling and uncoupling · Driving combination vehicles safely · Rollover and rearward amplification · Trailer air lines and glad hands · Inspecting combination vehicles
Pre-Trip Inspection & Safety
20%Seven-step inspection method · Engine compartment checks · Brakes, tires, and suspension checks · Lights, reflectors, and emergency equipment · In-trip and post-trip inspection
Frequently asked questions
How much does the CDL Class A cost?
Fees vary. Permit, testing, and licensing fees vary by state.
How long is the CDL Class A and how many questions does it have?
General Knowledge typically 50 questions; Air Brakes and Combination Vehicles typically 20–25 each (counts set by each state) — Varies by state; untimed or generously timed in most states.
What do you need to pass the CDL Class A?
80% on each knowledge test.
Can you retake the CDL Class A?
Varies by state; typically allowed after a short waiting period with a retest fee.
What is the best way to study for the CDL Class A?
Start from the official outline and your primary study materials: the exam is weighted by domain (General Knowledge 40%, Air Brakes 20%, Combination Vehicles 20%, Pre-Trip Inspection & Safety 20%). Once you've learned the material, spaced-repetition flashcards organized by those domains are an efficient way to retain it and refresh it before test day.
Ready to prepare?
Our CDL Class A — Commercial Driver's License program is organized by this outline's domains and scheduled by spaced repetition, with a path from first card to test day.
Flashcards are a memory tool. Learn the material first, then use NoReread to retain it and refresh what you already know. It doesn't replace studying the subject.