CDL Permit Prep: Practice Test
Air Brakes, Hazmat & Class A
Free
Study General Knowledge, Air Brakes, Combination Vehicles, Hazmat, Tanker, Doubles/Triples, Passenger, School Bus, Hours of Service, and Pre-Trip Inspection.
Study commercial learner's permit and CDL knowledge topics with CDL Permit Prep.
The app's question bank contains 1,319 multiple-choice practice questions: 959 with national scope and 360 focused on state-specific topics. These are counts in the app, not the length or question count of any state's exam. Topics include General Knowledge, Air Brakes, Combination Vehicles, Hazmat, Tanker, Doubles/Triples, Passenger, School Bus, Hours of Service, and Pre-Trip Inspection.
REVIEW QUESTIONS AND SOURCES
Read an explanation after each answer and open its source reference. Study the federal topics and state-specific material included in the app, then check your state's current CDL manual and licensing-agency guidance for requirements that apply to you.
PRACTICE YOUR PRE-TRIP CHECKS
Use the trainer to identify vehicle components, describe the checks you would make, and explain safety concerns. Follow your state's current CDL manual and test instructions. The trainer does not require a script; examples are optional prompts, so use your own words. Trainer feedback is for practice and is not an official test score.
STUDY BY CDL CLASS AND ENDORSEMENT
Choose the class and topics you want to study. Review missed questions and practice the included CDL subjects at your own pace.
Some CDL question translations are still under review and may appear in English with a notice. This app is study material, not an ELDT course and not a substitute for training required by FMCSA rules.
Practice is not the exam. Check your state's current commercial driver handbook and official licensing-agency information. For support, visit https://cdlpermitprep.org/support. CDL Permit Prep is an independent study product and is not an official licensing-agency service.
Ratings & Reviews
Updated practice questions: hundreds of questions now have stronger wrong answers, clearer wording and corrected answers, checked against the FMCSA manual, state guides and federal rules. Duplicate questions were replaced with new ones. HazMat and federal-rule questions now use plain English, and the pre-trip trainer adds coupling checks for tractor-trailers and passenger checks for buses. Every state has a page with its licensing facts and official sources. Most practice questions are national; state-specific questions cover only a few states.
The developer, Surabhi Agnihotri, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Contact Info
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Surabhi Agnihotri
- Size
- 104.6 MB
- Category
- Education
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - iPad
Requires iPadOS 26.0 or later. - Mac
Requires macOS 26.0 or later. - Apple Vision
Requires visionOS 26.0 or later.
- iPhone
- Languages
- English and Spanish
- Age Rating
4+
- 4+
- Copyright
- © 2026 CDL Permit Prep