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  • 0  (6 mistakes allowed to pass)

Free MS CDL Diagnostic Test 2025

Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements.

To get a rough idea of how much you know about commercial driving rules in Mississippi, try our MS CDL diagnostic test. It contains 30 multiple-choice questions on a variety of topics in commercial driving: air brakes, hazardous materials, buses, combination vehicles, and tanker trucks. This test will help you quickly identify gaps in your knowledge of commercial driving, which will be especially useful if you’re just starting to prepare for the CDL knowledge exams. Each practice question includes a picture and has four possible answers. Choose the most complete and correct answer for each question. Each question also comes with an optional hint if you need it and an explanation of the correct answer. Try our CDL diagnostic test and see whether you are ready for the real thing. Good luck, and drive safely!

Real exam-style pitfalls you’ll practice:
Common Traps
Distractors
Trick Wording
Double Negatives
Free MS CDL Diagnostic Test 2025
Commercial Driver's License
Based on official MS exam questions
Steven Litvintchouk, M.S., Chief Educational Researcher at Driving-Tests.org

Authored and fact-checked by Steven Litvintchouk, M.S.

Chief Educational Researcher, Driving‑Tests.org (ACES member)
Last verified for accuracy on
Methodology & Editorial Policy

5 min to complete
Available in EN and ES

What to expect on the actual MS permit test

50

questions

40

correct answers to pass

80%

passing score

Real Mississippi drivers who passed first try

Verified student reviews • Shared with permission

Was very helpful I passed all my test first try.
It was very helpful I passed all my test first try. So thanks so much for helping me out. I recommend everyone use this if they want a CDL.
A
App helped me so much after reading the MS CDL Book.
This site helped me so much after reading the MS CDL Book. The questions on this site resemble the exact questions on the test. Another thing about this site, it explains when you get a question wrong and also gives you hints when needed.
L
Was studying for my CDL from the MS manual.
I was studying for my CDL from the MS manual. I was so worried I would not pass I then went on line and was taking practice tests. I was afraid I wasn’t getting a wide variety of questions so I decided to purchase the study guide from Driving-Test.Org. So glad I did. It was a life saver. So many more questions and if you got them wrong they would save them so you could review them again. I took my test at the DMV this morning and passed with ease. Did not miss any for the air brakes or the passenger bus. Missed two in general knowledge and one in school bus. There were 115 questions I missed 3. I would highly recommend Drivers-test.org.
A
3 days to get permit.
After accepting a new job offer, I had 3 days to get my Class A CDL permit. I studied non-stop and had to spend about 4 hours per day understanding each test. After I could pass the practice test consistently, I went in to the DMV for the tests. Passed no problem. A few questions at the DMV I had never seen before, but even with that I passed well over 90%. I could not have done it in that amount if time by simply reading a 200-page CDL booklet that they gave me. It was well worth a monthly subscription. Thanks for everything.
CVG
Fantastic resource.
I did not have enough time before my CDL Class B Permit exam for General Knowledge, Air Brakes plus P and S endorsements so took a few of each practice exams. System said, b/c I really didn't get many practice tests in, that my probability was low for passing the real exam [really only b/c I didn't take enough of the practice tests].. well, I believe this product made all the difference b/c I Passed ALL 4 parts of my CDL Permit exams First TRY!
BS
I studied the material and took the Hazmat, doubles and triples, and tanker endorsement.
I studied the material and took the practice exams several times before sitting for the exam yesterday. I finished all three exams with no errors in 20 minutes and and received my CDL hazmat, doubles and triples, and tanker endorsements without any issues. Thank you for this preparation program, it really works! I would recommend this to everyone.
RS

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