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Free Oklahoma CDL HazMat Endorsement Practice Test 2025

Average pass rate for CDL tests in Oklahoma: 60%.
Average pass rate for this test: 64%.
Moderate
7 min
Score distribution:
90-100=>11%
80-89=>24%
70-79=>33%
60-69=>24%
<60%=>7%
Avg. first-try score: 76%

Oklahoma! Where the wind comes sweepin’ down the plain! If you’ve driven through the state’s gentle plains and prairies, the Ouachita and Ozark Mountains, or the narrow, unpaved, or low-maintenance roads in the rural areas, you’ve likely met the proud people of Oklahoma. Just like the many casts of the musical, Oklahoma’s landscape is diverse, offering challenges and opportunities to drivers who add the Hazardous Materials (Hazmat) endorsement to their Commercial Driver’s License (CDL). This is an amazing way to expand your job opportunities and increase your earning potential! Transporting cargo in Oklahoma comes with challenges, but the rewards offered in this career and the additional opportunities available with the Hazmat endorsement make it worth the effort.

To transport materials the U.S. government has deemed hazardous, you’ll need a Hazmat endorsement. In the Sooner State, hazardous materials transported include petroleum products, crude oil and natural gas, agricultural chemicals, industrial chemicals, and explosives. Some prominent organizations in Oklahoma, such as Devon Energy and Chesapeake Energy in Oklahoma City (oil and natural gas), ONEOK in Tulsa (natural gas), Phillips 66 in Bartlesville (oil refining and energy), Cargill and Simplot (agriculture and food processing), and Linde in Tulsa (distributor of gases and industrial chemicals) rely on Hazmat drivers for transport.

Free Oklahoma CDL HazMat Endorsement Practice Test 2025
Commercial Driver's License
Based on the official OK CDL HandbookHandbook‑based (2025) + exam‑taker feedback
14 OK students practicing now
•79completed today

Accuracy & authorship

Steven Litvintchouk, M.S., Chief Educational Researcher at Driving-Tests.org

Reviewed for legal and handbook accuracy:

Steven Litvintchouk

M.S., Chief Educational Researcher (ACES member)

Last verified for accuracy on

Andrei Zakhareuski, Co-founder & CEO at Driving-Tests.org

Test design and learning experience oversight:

Andrei Zakhareuski

Co-founder & CEO, Driving-Tests.org

Questions are created and maintained by the Driving-Tests.org content team following our multi-layer editorial process and updated whenever the Oklahoma DPS changes its handbook or website information.

Official sources we check: Oklahoma CDL Handbook (2025 edition), Oklahoma DPS website

How to use this practice test

  1. Start here. One of 4 free Oklahoma tests. ~7 min. Read explanations as you go.
  2. Cover more ground. All tests have different questions - no repeats.
  3. Finish strong. Try the Exam Simulator for a full-length run.

Why this works

  • Exam-like questions from the current handbook + real test-taker patterns. Explanations cite the manual.
  • AI Assistant explains tricky items in plain language.
  • Performance Insights show your weak topics and what to study next.
  • Challenge Bank™ saves your mistakes for targeted practice.

Actual DPS permit test: What to expect?

The Oklahoma permit test has 30 questions. You must get 24 correct (80%) to pass.

Real Oklahoma drivers who passed first try

Verified student reviews • Shared with permission

The Best Website for Preparing for Driving Knowledge Tests.
I had to take a Entry-level Driver Training Course (ELDT) before I could take the actual Hazmat Endorsement knowledge test. So, I turned to Driving-Tests for help, not only did they provide the study materials I needed to pass the Hazmat Endorsement knowledge test, they're listed in the Training Provider Registry (TPR), so, they're approved by the Federal Motor Carrier Safety Administration (FMCSA) to submit training completion certificates to the TPR. Needless to say, after successfully completing their ELDT course, they submitted my completion certificate to the TPR. I was then able to take my Hazmat Endorsement knowledge test and I passed it on my first attempt!
MD
Saved me time and money!
I was able to get my Hazmat ELDT certificate in under 1 day. Not only was it extremely fast, but I actually feel much more knowledgable on the subject. Much better alternative to spending thousands and going to a brick and mortar school!
AG

About the Oklahoma CDL

Now that we’ve gotten your attention with the sheer number of opportunities unlocked with this endorsement, let’s look at how to obtain it. First, you must complete a mandatory fingerprinting and background check conducted by the Transportation Security Administration (TSA). The results can take weeks, so get that started and use the wait time to study and practice for the second step: the DPS knowledge test. This test covers federal regulations, substance handling, packaging, quantity limits, and transport configurations for hazardous materials. With a score of 80% on Oklahoma’s 30-question knowledge test, you will pass the test (Oklahoma CDL Handbook 2025).

Oklahoma can use more Hazmat drivers, so we’ve simplified the process for you with Oklahoma DPS Hazmat Endorsement practice tests that present only the information needed, present immediate feedback on wrong responses, and resemble what you will face on the official DPS test. Once you receive your TSA results and feel prepared, you’ll visit the DPS with the necessary documents, pay the fees, and pass the test.

More OK CDL test resources HazMat practice test hub

  1. HazMat Test 1 (you are here)
  2. HazMat Test 2
  3. HazMat Test 3

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