With CDL Test Prep, you'll be prepared. Download it right now and be ready to ace your commercial driver's license (CDL) exam for Class A, B or C. - 1,000 state-specific exam-like CDL questions - The only program recommended by DMVs These are the topics covering in our free practice tools based on the CDL handbook: - General Knowledge - Air Brakes - Hazardous materials - Passenger Vehicles - Combination vehicles - Double and Triple Trailer Endorsement - Tanker vehicles endorsement - School bus endorsement - Pre-trip inspections This app is easy to use, covers all CDL endorsement materials, and includes the study guide questions which is great to help you understand. This app was helpful to study for the upcoming CDL exam. Disclaimer We are not associated with any DMV. This app is not intended to be relied upon in any dispute, claim, action, proceeding or for legal advice. For official law descriptions and administrative centers, please consult the respective state body. It is also highly recommended that new drivers take an approved driver education course to learn the rules and laws of the road, and to develop responsible driving habits.