CDL Permit Prep: Practice Test
Air Brakes, Hazmat & Class A
About
Prepare for your Commercial Driver's License (CDL) exam with a comprehensive question bank covering general knowledge, specific endorsements, and pre-trip inspections. Review explanations and source references for each answer to deepen your understanding.
What's New in CDL Permit Prep
1.0.11
October 12, 2026
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, and every state permit practice test is available.
MoreDeveloper apps
FAQ
What topics does CDL Prep. cover?
CDL Prep. covers a wide range of topics including General Knowledge, Air Brakes, Combination Vehicles, Hazmat, Tanker, Doubles/Triples, Passenger, School Bus, Hours of Service, and Pre-Trip Inspection.
How many practice questions are available in CDL Prep.?
The app features a question bank of 1,316 multiple-choice practice questions, with 956 of national scope and 360 focused on state-specific topics.
Does CDL Prep. offer explanations for answers?
Yes, CDL Prep. provides an explanation after each answer, allowing users to understand the reasoning and refer to source references for further study.
Can I practice pre-trip inspections with CDL Prep.?
Yes, CDL Prep. includes a trainer specifically for practicing pre-trip checks, where you can identify components, describe checks, and explain safety concerns.
Is CDL Prep. an official licensing-agency service?
No, CDL Prep. is an independent study product and is not an official licensing-agency service. It is study material and not a substitute for required training.
What is the update frequency for CDL Prep.?
The latest version of CDL Prep. is 1.0.6, which was last updated on September 29, 2026. Specific update frequency is not detailed, but it is actively maintained.
What devices is CDL Prep. available on?
CDL Prep. is available on iPhone and iPad devices, catering to users who prefer to study on Apple's mobile platforms.
Does CDL Prep. have ads?
No, CDL Prep. does not contain advertisements, providing an uninterrupted study experience for users.