Quiz to test your knowledge
Free online tests based on official CDL exams — General Knowledge, Air Brakes, Combination, and endorsements.
Start preparationThe CDL prep app in your language. Start with free practice tests.
Real exam-style CDL permit questions with explanations — in Spanish, Russian and 8 more languages. Built by drivers, for drivers.
4.95,244 ratingson the App Store
4.9770 ratingson Google Play
Store ratings as of Sep 2, 2026
Free practice tests on this site. All 2,500+ questions are in the app with a subscription.
Multi-language interface
Progress tracker and important action items
Flashcards and useful resources
State-specific tests and official handbooks
Are you ready for the CDL test? Find out in 3 questions.
Take the test simulator, find out your level. Prepare and reinforce material with our app, flashcards, quizzes.
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Practice tests by endorsement and class
Frequently Asked Questions
How many questions are on the exam?
General Knowledge - 50 questions, Air Brakes - 25 questions, Combination - 20 questions.
How many mistakes can I make?
You need to answer 80% of questions correctly to pass.
Can I take the exam without knowing English?
In some states the written knowledge test is offered in other languages (Spanish is the most common), but this varies by state and the driving test is always in English. Federal rules now require English proficiency to drive commercially, so you can study in your language but should plan to build the English you'll need.
How to get access to all tests? Is the app paid?
The app is free to start — the first section of every test is free. A subscription unlocks all 2,500+ questions, every endorsement test, and the study tools.
How many questions are in the app, and what does the subscription include?
The app has over 2,500 questions. The first section of every test is free; a subscription unlocks the rest — every test and endorsement, plus progress tracking and offline study.
Did you really add all possible questions?
We regularly update the question bank based on official DMV sources from each state.
How long does it take to prepare for the CDL exam?
Most students need 2-4 weeks of regular practice to prepare for the written CDL exam. Daily practice sessions of 30-60 minutes in our app help you learn the material and see what you still need to review.
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