MODULE GK
General Knowledge
The starting section for most CDL applicants
- Safe driving
- Vehicle systems
- Cargo and emergencies
CHOOSE YOUR TEST
Practice the section you actually need.
Choose a module based on your license class, vehicle, and endorsements. Read the guide when the rules are unfamiliar, or take the diagnostic first to find the topics costing you points.
MODULE AB
Air Brakes
Drivers testing in vehicles equipped with air brakes
- System components
- Pressure and warnings
- Inspection procedures
MODULE CV
Combination Vehicles
Most Class A tractor-trailer applicants
- Coupling
- Trailer control
- Rollover and braking
MODULE HM
Hazardous Materials
H applicants and the HazMat portion of the X endorsement
- Placards
- Shipping papers
- Loading and emergencies
MODULE TK
Tanker (N)
Drivers who need the tank vehicle endorsement
- Liquid surge
- Tank inspection
- Safe stopping and turns
MODULE DT
Doubles & Triples (T)
Class A drivers pulling multiple trailers
- Converter dollies
- Coupling order
- Crack-the-whip control
MODULE PT
Pre-Trip Inspection
Applicants preparing for the CDL skills test
- Component identification
- Unsafe conditions
- In-cab checks
Build one test plan—not seven random ones.
1
Build the base
Start with General Knowledge.
2
Match the vehicle
Add Air Brakes and Combination Vehicles when they apply to your test vehicle and license class.
3
Add the job
Study HazMat, Tanker, or Doubles & Triples only when your endorsement path requires them.
4
Prepare for skills
Finish with Pre-Trip practice and the procedure in your current state CDL manual.
STATE RULES STILL MATTER
Choose My State
Match the module with your state guide.
Core CDL subjects are federal, but applications, fees, scheduling, handbook editions, and testing procedures are handled by your state. Check both before test day.
MORE PRACTICE-TEST RESOURCES
Questions, explanations, and exam guides
How Many Questions Does the Online CDL Test Have in Iowa? (2026)
Iowa publishes the exact question count for every CDL test. Here are all nine, the pass math, and the truth about the online CDL test in Iowa.
Free HazMat Practice Test 2026: 12 Questions With Explanations
Use 12 explained HazMat questions to identify the rule groups you miss, then continue into focused diagnostic and full-bank practice.
CDL Mock Test 2026: The 75-Question DMV Pretest Simulator
Stop studying one subject at a time. This CDL mock test mixes all three core exams into one timed session, exactly like the real DMV. Find your weak spots before test day.
CDL Pretest 2026: Free Practice Questions, Study Strategy & What Actually Shows Up on the Exam
Stop walking into the DMV blind. This free CDL pretest covers the exact topics that show up on the real 2026 permit exam, complete with detailed explanations and a 7-day study plan.
DMV CDL Practice Test vs. Real Exam: What to Expect at the Counter in 2026
The real DMV CDL exam looks nothing like your phone screen at home. We break down the actual computer interface, the skip button strategy, and the number one reason prepared people still fail.
CDL Air Brakes Cheat Sheet 2026: 7 Numbers You Must Memorize
The ultimate quick-reference cheat sheet for the CDL Air Brakes test. Memorize the 7 magic PSI numbers, master the L.A.B. sequence, and pass on your first try.
NJ CDL Test Questions & Answers PDF: 2026 MVC Cheat Sheet
The NJ MVC written exam is known for being one of the trickiest in the country. Get the questions, answers, and the infamous 6 Points of ID walkthrough.
Free CDL Test Questions and Answers 2026: Printable Study Guide
Print a focused CDL sample, identify the module costing you points, then move into timed diagnostic and full-bank practice.
Class B CDL Practice Test 2026: Build the Right Test Plan
Identify the Class B tests your vehicle requires, measure your current score, and close weak areas before scheduling the permit exam.
CDL Combination Vehicles Practice Test 2026: Coupling & Trailer Questions
The Combination test is only 20 questions but covers complex coupling and trailer systems. Practice with our free test before going to the DMV.
Free Tanker Endorsement Practice Test 2026: 10 Explained Questions
Use 10 explained N endorsement questions to find weak topics before paying for a state retest or unlocking the complete practice bank.
Michigan CDL Test Questions & Answers 2026: SOS Cheat Sheet
The Michigan SOS test includes unique questions about Seasonal Load Restrictions. Study these verified questions and answers to pass in 2026.
Texas General Knowledge CDL Test 2026: Topics and Study Plan
Study the inspection, safe-driving, space-management and cargo concepts in Texas General Knowledge, then diagnose your weak areas.
100+ Real CDL Exam Questions & Answers (2026 Edition)
Stop searching. We have compiled the top 100 most common questions from the 2026 CDL exams into one master list. Review them before your test.
Free CDL Practice Test 2026: General Knowledge, Air Brakes & Combination Questions
Most free CDL tests are dangerous because they are outdated. Use our verified 2026 question bank with detailed explanations to pass your permit test on the first try.
Texas CDL HazMat Test 2026: DPS, ELDT and Fingerprinting Steps
Prepare for the Texas H endorsement in the correct order: ELDT, DPS application and test, fingerprinting, then TSA clearance.
Class A CDL Practice Test 2026: The Complete 3-Part Guide
To drive a 'Big Rig', you need to pass three specific tests. We break down the Class A requirements, study strategies, and tough questions.
CDL Air Brake Test Questions and Answers 2026: Find Your Weak Areas
Use explained Air Brakes samples to identify weak topics, then verify readiness with a fresh diagnostic before your state test.
CDL Practice Test General Knowledge: 2026 Real Questions & Guide
Take our free CDL practice test general knowledge exam. Updated for 2026. Master stopping distance formulas and safety rules with this simple guide.
Class B CDL Practice Test 2026: Study Guide & Requirements
Driving a dump truck or box truck? You don't need to study Combination Vehicles. Here is the focused 2026 study guide for Class B drivers.
Doubles & Triples Practice Test 2026: The Complete 'T' Endorsement Guide
Want to work for LTL giants like FedEx or UPS? You need the 'T' Endorsement. Learn the physics of pulling two trailers and how to pass the written test.