About the App
The easiest way to prepare for your CDL knowledge test in any US state
CDL Prep Pro is designed to help you pass the Commercial Driver License knowledge test on your first try. Whether you're preparing for a Class A, B, or C CDL, studying for endorsements like air brakes, hazmat, tanker, doubles/triples, passenger, or school bus — our app covers all 50 US states with official-style practice questions and realistic mock tests tailored to your state's requirements.
Key Features
Everything you need to pass your CDL test
Practice Questions
Study hundreds of CDL-specific questions with detailed explanations. Get instant feedback and learn from your mistakes.
Mock Test Mode
Simulate the real CDL exam with 25-question practice tests. Track your score and see if you're ready to pass.
CDL Road Signs
Learn all essential commercial vehicle road signs including hazard warnings, weight limits, railroad crossings, and more with clear explanations.
Track Progress
Monitor your learning with detailed statistics including total questions answered, accuracy, and best test scores.
Bookmark Questions
Save difficult questions for later review. Focus on what you need to improve and master challenging topics.
Quick Practice
Short on time? Take a quick 5-question practice session for daily review and continuous improvement.
CDL Prep for All 50 States
Select your state and start practicing today
Commercial Driver License (CDL)
Comprehensive CDL preparation for all 50 US states including General Knowledge, Air Brakes, Combination Vehicles, and all endorsement tests.
Covering: Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming
Pick Your State. Pass Your Test.
$3.99 per state. Try 14 questions free first.
Unlock Any State
Per state • One-time • Lifetime access
First 14 questions free — try before you buy
- Full question bank for your chosen state
- Unlimited mock tests
- Complete road signs guide
- Progress tracking & stats
- Bookmark & mistake review
- Works 100% offline
- All CDL endorsements included
- No subscription. Pay once, own forever.
Need another state? Unlock it for $3.99. You only pay for states you actually test in. No bundles. No bloat. No subscriptions.
Download Now
Start preparing for your CDL test today
Available on iPhone and iPad • Requires iOS 16.0 or later