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Based on official Oklahoma exam questions

Free OK CDL Diagnostic Test 2025

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

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 Oklahoma, try our OK 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!

Pass the first time with Premium
97% of our Premium users pass first try
5 min to complete
Available in EN and ES
OK commercial driver's license
Real exam-style pitfalls you’ll practice:
Common Traps
Distractors
Trick Wording
Double Negatives

Verified for accuracy: October 2025

Reviewed by Steven Litvintchouk, M.S.
Chief Educational Researcher (ACES member)
Methodology & Editorial Policy

What to expect on the actual OK exam

50

questions

40

correct answers to pass

80%

passing score

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