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Free OK CDL Diagnostic Test

  • Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
  • Based on 2024 OK commercial driver's license manual
  • Updated for July 2024
Verified by Steven Litvintchouk, M.S., Chief Educational Researcher, Member of ACES. See our detailed commitment to accuracy and quality in our practice tests.
OK commercial driver's license

About this test

5 min to complete
Available in EN and ES

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!

What to expect on the actual OK CDL exam

50

questions

40

correct answers to pass

80

passing score

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