CDL Prep 4+

Commercial Drivers License

Jeffrey Diaz

    • Free



CDL Prep is the best way to prepare for the Commercial Drivers License General Knowledge, and various endorsement exams. CDL Prep contains questions on the following topics: General Commercial, Air Brakes, Combinations, Hazmat, Passenger, Tanks, School Bus, and Doubles/Triples.

1. Over 500 questions to practice with.

2. Exam Mode - 60 minutes to answer 50 randomly chosen questions, or 40 minutes to answer 20 to 30 questions on endorsement topics. At the end, review your score and any incorrect answers.

3. Practice Mode - Answer questions and receive instant feedback if you answered incorrectly.

4. Answer Randomization - Answers to questions will not always be in the same position.

Please send any feedback or request to: Thank you for reading, and good luck on your exams!

What’s New

Version 8.7.1

Small number of bug fixes and grammatical improvements.

Ratings and Reviews

4.7 out of 5
3.1K Ratings

3.1K Ratings

Will not be using uber eats ,

Thank you Thank you Thank you !!!!!

Read the Questions STUDY the ANSWERS, cdl prep tells you why the question is wrong and pulls a segment from the book to go over , you can pull out your manual read the statement for yourself or real it off your screen either or CDL PREP has no videos no fine line of information thats going to jump out at you , you have to read and study the questions and why your answers are wrong , the DMV questions are the same if not VERY VERY SIMILAR to every question asked on cdl prep , just study the information and why you got the question wrong i learned more off cdl prep that i wouldve reading the entire book front to back THANN YOU CDL PREP for helping me began my journey to financial freedom i passed my General knowledge 100% , Air breaks 95% & Combinations 94% on my first try all flying colors because of you i am so fortunate to have been granted with this app THANK YOU THANK YOU THANK YOU!!!!!

Peach rings39 ,

Great app. 2023

Hi… I wasn’t how true this app was when it came to testing and studying the book but, after studying the book and the app for most part is pretty much the same question. After passing my first test I’ve put my trust in the app for every test after my (doubles/triples) test. I didn’t read the book once I passed with just studying the app. The only test that gave me a issue was my hazmat test. I would definitely recommend reading the book for that part. That took me to my 3rd try to pass. This app for (hazmat) doesn’t have all the updated questions. But speaking for every other endorsement I only used the app and passed everyone under 2mins. However, everyone is different. Thank you for the app. It only took me 3 weeks to get my permit and all my endorsements from just studying the app. Good luck everyone ✊🏽

Communist_Jesus ,

I was skeptical

Arrived in Missouri for trucking like I’m sure many of you are reading this. Had instructors trash talk this app saying it wasn’t accurate, but lo and behold, I passed with 90% or greater on all four endorsement tests. It works. Make this your Bible and study it until you want to vomit, then study again and you will pass. My only complaint is that there were some questions on the general knowledge portion that were not on this app, but I still managed to pass it with 90% and so should you. The other endorsements were 100% accurate compared to this prep app. Hats off to the app creator, thank you sir. Also, you can skip ads even if there isn’t an X mark in the top right corner by just tapping on it, the ads help make it free for the developer to profit and honestly weren’t too annoying once I figured out how to skip immediately. Good luck!

Developer Response ,

I will review and correct if necessary, thanks for the report.

App Privacy

The developer, Jeffrey Diaz, 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 Used to Track You

The following data may be used to track you across apps and websites owned by other companies:

  • Location
  • Identifiers
  • Usage Data
  • Diagnostics

Data Linked to You

The following data may be collected and linked to your identity:

  • Location
  • Identifiers
  • Usage Data
  • Diagnostics

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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