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CDL Practice Tests 2026

CDL practice tests that tell you when you're ready to pass

Practice CDL questions covering General Knowledge, Air Brakes, HazMat, and all endorsements - built from official state CDL handbooks with detailed explanations for every answer. Free to start, no sign-up required.

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2,800+

CDL questions

50

states covered

All

sections & endorsements

100%

with explanations

1

Practice with real questions

~5,000 questions from official CDL handbooks. Every answer includes a detailed explanation and handbook reference.

2

Focus on what you get wrong

Questions you miss come back automatically. The system tracks your weak spots across every endorsement and builds a personalized study plan.

3

Know when you're ready

Your IQ Readiness Score™ tracks 6 dimensions of readiness. When you hit 80%+, you're ready to book your test.

Learn more about the science behind DMV IQ →

~0%Sample Score

Know exactly when you're ready

The IQ Readiness Score measures six dimensions of CDL test readiness: memory stability, test performance, content coverage, recent accuracy, difficulty mastery, and reaction speed.

See Plans & PricingStarting at $12.99 · 48-hour money-back guarantee
7,500+ questions51 official handbooksVerified June 2026
Included with Pro
6-dimension CDL analysisTracks your readiness across General Knowledge, Air Brakes, HazMat, and every CDL endorsement you're studying for.
Personalized CDL study pathAutomatically prioritizes your weakest CDL topics and endorsement areas so you study what matters most.
CDL pass probabilityReal-time estimate of your likelihood of passing based on your practice performance across all CDL sections.
Weak topic recoveryIdentifies and re-drills the specific CDL topics dragging your score down until they become strengths.

CDL Classes: A, B & C

CDL licenses are divided into three classes based on vehicle weight and type. Your class determines which vehicles you can operate and which endorsement tests you need to take.

A

Class A

Combination vehicles with a GCWR of 26,001+ lbs when the towed vehicle exceeds 10,000 lbs. Includes tractor-trailers, flatbeds, livestock carriers, and tankers.

Includes: Combination Vehicles, Doubles/Triples + all shared CDL topics
B

Class B

Heavy single vehicles with a GVWR of 26,001+ lbs, or towing a vehicle under 10,000 lbs. Includes straight trucks, large buses, dump trucks, and box trucks.

All shared CDL topics (no combination vehicles content)
C

Class C

Vehicles under 26,001 lbs designed to transport 16+ passengers or carrying hazardous materials requiring placards. Includes small passenger vans and HazMat delivery vehicles.

All shared CDL topics (no combination vehicles content)

CDL Endorsements

Each section is a separate written test. Start with the core knowledge tests, then add the endorsements your job needs. Every set is free.

Core knowledge tests

General Knowledge

Required first

50 questions · 90 min · 80% to pass

Every CDL starts here. Vehicle control, safe driving, and cargo basics that every commercial driver must pass, regardless of class.

Air Brakes

25 questions · 30 min · 80% to pass

Removes the air brake restriction from your CDL. Covers system components, inspection steps, and braking with air-equipped vehicles.

Combination

Class A only

20 questions · 25 min · 80% to pass

Required for Class A. Coupling and uncoupling, trailer handling, and preventing rollovers and jackknifes in tractor-trailer rigs.

Pre-Trip Inspection

Skills test · Part 1

The first part of the skills test and the most failed. Learn the full inspection sequence before you start the engine on test day.

Endorsements

HazMat(H)

Most popular

30 questions · 40 min · 80% to pass

Transport hazardous materials. Placarding, loading rules, and emergency response. Requires a TSA background check in every state.

Tanker(N)

20 questions · 25 min · 80% to pass

Drive tank vehicles carrying liquids or gases. Surge control, baffled vs. unbaffled tanks, and the handling risks of liquid loads.

Passenger(P)

20 questions · 25 min · 80% to pass

Carry 16 or more passengers. Loading, emergency exits, railroad crossings, and the rules that apply to buses of every kind.

School Bus(S)

20 questions · 25 min · 80% to pass

The most regulated endorsement. Student loading zones, danger zones around the bus, and emergency procedures. Requires P first.

Doubles/Triples(T)

20 questions · 25 min · 80% to pass

Pull double or triple trailers with a Class A. Coupling sequence, crack-the-whip effect, and multi-trailer stability.

CDL Practice by State

CDL knowledge tests are administered by your state’s DMV or licensing agency. While the CDL handbook is standardized nationally by the FMCSA, each state sets its own fees, procedures, and additional requirements. Select your state for practice questions tailored to your state’s CDL test.

AlabamaAlaskaArizonaArkansasCaliforniaColoradoConnecticutDistrict of ColumbiaDelawareFloridaGeorgiaHawaiiIdahoIllinoisIndianaIowaKansasKentuckyLouisianaMaineMarylandMassachusettsMichiganMinnesotaMississippiMissouriMontanaNebraskaNevadaNew HampshireNew JerseyNew MexicoNew YorkNorth CarolinaNorth DakotaOhioOklahomaOregonPennsylvaniaRhode IslandSouth CarolinaSouth DakotaTennesseeTexasUtahVermontVirginiaWashingtonWest VirginiaWisconsinWyoming

Interactive CDL guides

Free trainers and data tools for the parts of the CDL that trip drivers up the most.

Pre-Trip Inspection Trainer

Interactive walk-around and a say-it-out-loud drill for every FMCSA spec you must memorize.

Air Brake Check Simulator

Step through the full air-brake check with a live PSI gauge, plus the CVSA data on why brakes matter most.

HazMat Endorsement Guide

The TSA background check, the cost, and an explorer of all nine hazard classes.

Where Triple Trailers Are Legal

An interactive map of where triple trailers are actually legal, and the 1991 freeze behind it.

CDL Study Guides

CDL Practice Test: What to Expect and How to Prepare

CDL · 7 min read

CDL Practice Test: What to Expect and How to Prepare

The CDL knowledge test is longer and harder than the regular DMV test. Here's how to prepare efficiently.

Read more
CDL Endorsements Explained: H, N, P, S, T, X

CDL · 6 min read

CDL Endorsements Explained: H, N, P, S, T, X

Each endorsement opens different job opportunities. Learn what H, N, P, S, T, and X mean and which ones you need.

Read more

CDL Frequently Asked Questions

A Commercial Driver's License (CDL) is required to operate commercial motor vehicles (CMVs) over 26,001 pounds GVWR, vehicles designed to transport 16+ passengers, or any vehicle carrying hazardous materials requiring placards.
Class A covers combination vehicles with a GCWR of 26,001+ pounds when the towed vehicle is over 10,000 pounds. Class B covers single vehicles of 26,001+ pounds GVWR. Class C covers vehicles designed for 16+ passengers or HazMat vehicles.
Entry-Level Driver Training (ELDT) is a federal requirement effective since February 2022. You must complete ELDT through an FMCSA-registered training provider before taking the CDL skills test for a Class A or B CDL.
The CDL general knowledge test typically has 50 multiple-choice questions, and you need a score of 80% or higher to pass.
CDL costs vary significantly by state. The CDL application and testing fees typically range from $50 to $200. ELDT training costs $3,000 to $7,000 or more.
You can get a CDL at 18 in most states, but you will be restricted to intrastate (within your state) driving only. Federal law requires you to be at least 21 to drive across state lines.
The knowledge is federal, so the FMCSA standardizes the handbook and the topics. But each state sets its own fees, procedures, and extra requirements, and question wording varies, so practice with your state's version.
CDL Practice Test 2026 - Free CDL Prep for All States | DMV IQ