Pass Your CDL Class A Exam with Confidence
Study the exact topics you need for your Class A permit, including General Knowledge, Air Brakes, Combination Vehicles, and state-specific rules — all explained in simple, beginner-friendly language.
Get Ready for Your Class A CDL Permit
A Class A CDL allows you to drive combination vehicles with a gross combination weight rating of 26,001 pounds or more, as long as the towed vehicle is over 10,000 pounds
PrepCDL helps you study the most important exam topics, practice realistic questions, and understand the rules before test day.
- Tractor-trailers and 18-wheelers
- Truck and trailer combinations
- Tanker vehicles, flatbeds, and other heavy combinations
Master the Tests Class A Drivers Need
Study and practice the required written tests for your Class A permit — general knowledge, air brakes, and combination vehicles.
General Knowledge
50 practice questions
Study safe driving, vehicle inspections, basic control, shifting, road signs, cargo safety, and the rules every CDL driver must know.
Air Brakes
25 practice questions
Learn air brake systems, inspections, warning signals, stopping rules, and what to check before driving.
Combination
20 practice questions
Study coupling, uncoupling, trailer safety, off-tracking, rollover risks, and safe handling of tractor-trailers.
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
How many questions are on the CDL Class A exam?
The general knowledge portion typically includes 50 questions, and you must score at least 80% to pass. Additional endorsement tests (air brakes, combination vehicles, hazmat) add 20–30 questions each depending on your state.
Is there an age requirement for a Class A CDL?
You must be at least 18 years old to obtain a CDL for intrastate driving and at least 21 for interstate commerce or to haul hazardous materials. Some states may have additional requirements.
What endorsements are included in the Class A prep?
Our Class A prep covers general knowledge, air brakes, and combination vehicles as core requirements. Optional endorsement modules include hazmat, tanker, doubles/triples, passenger, and school bus.
Can I study on my mobile phone?
Yes. PrepCDL is fully responsive and works on any smartphone or tablet. Practice tests, study guides, and progress tracking are available wherever you have an internet connection.
Ready to Pass Your Class A Exam?
Start practicing today, then unlock lifetime access to every Class A topic, endorsement, and study guide with one simple payment.
One-time payment. No subscription required.