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  • 0  (6 mistakes allowed to pass)

Free CT 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 Connecticut, try our CT 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 CT CDL Diagnostic Test 2025
Commercial Driver's License
Based on official CT 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 CT permit test

50

questions

40

correct answers to pass

80%

passing score

Real Connecticut drivers who passed first try

Verified student reviews • Shared with permission

Was in and out of there within minutes.
I was in and out of there within minutes. So I recommend this. It's insurance to make sure that you get an actual career going, because without this, without the actual permit, you're going nowhere.
B
Best site.
It is very easy to navigate through the different tests. All the information is very helpfull, especially the Ai assist incase you ever have a question. Update 04/15/24: Passed my cdl permit exams first try. Questions were practially spot on with the practice tests
AS
The learning questions are 100% realistic.
The questions are almost the real questions as in the exam. More importantly, there are no superfluous questions. To test my skills further, I used another app on the market for a short moment, which asked questions that were not on my CDL exam at all. For example, no traffic signs are asked. Therefore, I can say that you can rely on the questions and your own learning progress with Driving-Test. I finished my written exam after a few minutes. And it's worth mentioning, I just recently moved to the US and am not a native English speaker.
MT
Great site.
I was using another for 3 weeks and I failed on my first attempt. I went to driving-tests.org 2 days before the test. I crammed and passed my cdl permit just in time to start my class.
J
While searching for information about….
While searching for information about how to obtain a Commercial Driver's License I came across the website. The information I found there was clear and concise. As I spent more time on the site, I found more information specific to my needs. I was really happy when I got to the portion of the site which offers test preparation materials. The methods used by Drive-Tests fit my learning style and I have gained confidence as I approach my test at the Department of Motor Vehicles.
AC
This Program IS THE Real CDL DEAL!
This program is the real deal. I took 4 tests today - the CDL General Knowledge, Air Brakes, Combinations, as well as the Class C. There were no surprises! After going through the program I can honestly say that I aced each test. I can't remember ever being so well prepared for a test of any kind before! If you want to pass your CDL with flying colors - then this is the program for you. I can't say enough good things about it!
JJ

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