Published by Jeffrey Diaz on Apr 18, 2024

Report an issue with CDL Prep.
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Why should I report an Issue with CDL Prep?

  1. AppContacter will directly Email your issue/feedback to an apps's customer service once you report an issue and with lots of issues reported, companies will definitely listen to you.
  2. Pulling issues faced by users like you is a good way to draw attention of Jeffrey Diaz to your problem using the strength of crowds.
  3. Importantly, customers can learn from other customers in case the issue is a common problem that has been solved before.
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About CDL Prep

1. CDL Prep contains questions on the following topics: General Commercial, Air Brakes, Combinations, Hazmat, Passenger, Tanks, School Bus, and Doubles/Triples. 2.

2. Exam Mode - 60 minutes to answer 50 randomly chosen questions, or 40 minutes to answer 20 to 30 questions on endorsement topics.

3. Practice Mode - Answer questions and receive instant feedback if you answered incorrectly. 4.

4. CDL Prep is the best way to prepare for the Commercial Drivers License General Knowledge, and various endorsement exams.

5. Answer Randomization - Answers to questions will not always be in the same position. 5.

6. Red = You have an average score less than 70%, Orange = You have an average score between 70-89%, Green = You have an average score of 90% and above.

7. At the end, review your score and any incorrect answers. 3.

8. Performance tracking - Review your performance on every question.

9. Please send any feedback or request to: CDLPrepApp@gmail. com.

10. Thank you and good luck on your exams!

CDL Prep Customer Insights

1. Thank you!This is a good one guys , this one have less questions, I did pass combination and air break from another app , but when my friend told me about this , I'm not even take one ,week I week the knowledge general and I go to dme one time I pass it with this appit has alot of questions but you can only do the exam like test for general questions you can't just test on anything you're forced to do all 9 test at the same time very badly designed.It's pretty good it has most of the questions that are going to be on the test.

2. Only because their test had questions that werent on the app unfourtunatly.This is a great app study it for 30days passed my test the first time.

3. 6/30/23Came in to renew my license turns out i have to do the written test all over again.....this app has the SAME EXACT QUESTIONS I JUST SEEN ON THE TEST for California..thanks to the creator of this app its helped me before and keeps helping now...nvm the ads dont let them get to you just be happy someone actually created this and is spot onIllinois.

4. I don't mind ads... they're necessary but if I have to close the app every time lending tree comes up I might as well get a different appThis app is amazing! I passed my permit test today 100% with 0 wrong.

5. While I still passed the 4 tests I needed to pass, there were still questions on the actual exam that weren't on this apps study material.

6. This App is awesome!!! It has helped me pass my CDL test for General, Combination, and Air Brakes.

7. It is word for word identical for Illinois to what you will see on their test.

8. Great great great it is right on with the questions.

9. If you pass this app over and over with a good score, you will pass with flying colors at the Illinois DMV.

10. I took my cdl test.

11. Out of four tests I passed three but failed the last one.

Steps to Troubleshoot & Fix CDL Prep Issues

1. Fix CDL Prep Not Working/Crashes/Errors/Unresponsive & Black/White screen:


  1. Restart CDL Prep: Restarting the app will resolve most errors.
  2. Update the CDL Prep App. Here is how:
    1. On Android goto PlayStore » Search for "CDL Prep" » Open CDL Prep » click "Update".
    2. On iPhone, goto AppStore » Your profile » Available Updates » Check for CDL Prep » click "UPDATE".
  3. Clear CDL Prep app cache: Clearing cached data will force your app to retrieve the latest data directly from CDL Prep servers.
    1. On Android, goto Settings » Apps » Select "CDL Prep" » click Storage » click "Clear Cache".
  4. Check CDL Prep app permissions. If any of these permissions required to use your device's features are disenabled, CDL Prep might not work.
  5. Uninstall and reinstall CDL Prep. If nothing else has worked, completely uninstall CDL Prep then reinstall.
  6. Restart your device. Last, restarting your device can often clear most problems causing CDL Prep not working


2. Fix CDL Prep Server issues & Internet Connection


  1. Check network connection: An unstable Internet will make CDL Prep be unable to connect to it's servers. Ensure your wi-fi is working then restart app.
  2. Disable VPN: VPN can cause connection errors and lead to CDL Prep not working. Make sure all VPNs are off
  3. Enable background data: When Background data is turned off, CDL Prep may not be able to connect to the Internet when running in the background.

Reported Issues