Pass Your CDL Exam with Confidence
Prepare for your Class A, Class B, or Class C CDL with simple study guides, realistic practice tests, and endorsement prep built for first-time CDL students.
Find the Right CDL License for Your Driving Career
A Commercial Driver’s License, or CDL, is required to operate many large, heavy, passenger, or hazardous-material vehicles. The CDL class you need depends on the type of vehicle you plan to drive and the job you want.
PrepCDL helps you understand your license options, study the right topics, and practice with questions that match the real exam format.
- Class A — Tractor-trailers and large combination vehicles
- Class B — Straight trucks, dump trucks, and large buses
- Class C — Passenger vehicles and hazmat vehicles that do not fit Class A or B
Choose Your CDL Class
Not sure which license you need? Explore Class A, Class B, and Class C prep for the vehicle you plan to drive.
Class A CDL
Tractor-trailers, 18-wheelers, and large combination vehicles with a GCWR over 26,001 pounds.
Class B CDL
Straight trucks, dump trucks, box trucks, and large buses over 26,001 pounds GVWR.
Class C CDL
Passenger vehicles and hazmat loads that do not fit Class A or B but still require a CDL.
See If You're Ready for the CDL Exam
Try a sample question from our practice test and see how PrepCDL explains the topics you need to pass.
What is the most important reason for doing a vehicle inspection?
Why Choose PrepCDL?
Everything you need to study smarter, practice faster, and walk into your CDL exam prepared.
1000+ Practice Questions
Practice with exam-style questions covering CDL rules, safety, inspections, endorsements, and real test topics.
State-Specific CDL Prep
Study material tailored to your state’s CDL manual so you focus on the rules that matter for your test.
Realistic Exam Practice
Build confidence with practice tests, randomized questions, progress tracking, and detailed answer explanations.
CDL Prep by State
Pick your state for practice tests and study guides aligned with your local CDL exam.
All states
Frequently Asked Questions
What are the three classes of CDL?
Class A covers combination vehicles over 26,001 lbs GCWR. Class B covers single vehicles over 26,001 lbs GVWR. Class C covers vehicles under 26,001 lbs that carry hazmat requiring placards or 16+ passengers.
How many questions are on the CDL general knowledge test?
The number of questions can vary by state, but many CDL general knowledge tests include around 50 questions. Most states require a passing score of at least 80%.
Which CDL class should I get?
It depends on the vehicle you want to drive. Choose Class A for tractor-trailers, Class B for large single vehicles like dump trucks or buses, and Class C for smaller passenger or hazmat vehicles that still require a CDL.
Can I study on my mobile phone?
Yes. PrepCDL works on desktop, tablet, and mobile, so you can study guides, answer practice questions, and review explanations anywhere.
Ready to Pass Your CDL Exam?
Start practicing today, then unlock lifetime access to every CDL class, endorsement, and study guide with one simple payment.
One-time payment. No subscription required.