Oklahoma CDL practice test

Getting a commercial driver's licence in Oklahoma starts with the CDL knowledge tests. The content is federal: every state, Oklahoma included, writes its tests from the FMCSA CDL manual, so the general knowledge test has 50 questions, the endorsement tests have 20 to 30, and the passing score is 80% on each. Service Oklahoma administers the test; the rules behind it are published by the FMCSA. Try the free Oklahoma CDL practice questions below, then pick a full test.

50general knowledge questions
80%passing score on every test
8knowledge tests covered
OKpick your state once in the app

Free Oklahoma CDL practice quiz

Five questions from the general knowledge, air brakes and combination vehicles banks, the three tests most Oklahoma Class A applicants take first. Tap an answer to see if you were right and read the explanation.

0 of 5 right0 of 5 answered

A 'wig wag' low-pressure warning device:
The stop light switch in an air brake system is:
Some older vehicles have a front brake limiting valve with a 'normal' and 'slippery' setting. How should it be used?
Spring brakes are held in the released position by:
The braking power of spring brakes depends on:

Every CDL test for Oklahoma drivers

Each page has a free ten-question quiz, the real question count, the 80% pass mark and what the test covers.

How the Oklahoma CDL knowledge test works

You take the general knowledge test first; it is required for every CDL class. Class A drivers add the combination vehicles test. Almost everyone takes the air brakes test, because skipping it puts an air brake restriction on the licence. Endorsements (hazmat, tanker, doubles/triples, passenger, school bus) each have their own knowledge test. Pass the tests and you hold a commercial learner's permit; the skills test in a truck comes later.

Fees, appointment rules and test centre locations are set by Oklahoma; the current ones from Service Oklahoma are in the next section. What does not change is the content, and that is what PassRig drills.

Oklahoma CDL fees and rules

In Oklahoma the CDL is issued by the Service Oklahoma. The figures below are taken from its own pages and were last checked on 2 November 2026. Fees and rules change, so confirm with the agency before you go.

Study from the state's own book: Oklahoma CDL Driver Manual. PassRig's questions are written from the same FMCSA manual it is based on.

What	OK	Source
CDL fee	$81.50 Class A, $71.50 Class B, $61.50 Class C	oklahoma.gov
Retest fee	$4.00 added to the licensing fee for each retest, written or drive	oklahoma.gov
Permit valid for	Cannot be renewed	oklahoma.gov
Appointment	Written test taken in person; most locations offer walk-ins and appointments	oklahoma.gov
Medical certificate	DOT Medical Card required if you self-certify as Non-Excepted Interstate	oklahoma.gov
Entry-level driver training	Must be completed before the skills test; recommended before the written test	oklahoma.gov
Also worth knowing	CLP must be held 14 full days before the drive test	oklahoma.gov

5 official pages from Service Oklahoma were read for this section. Nothing on it is estimated.

Oklahoma CDL test questions

How many questions are on the Oklahoma CDL test?

The Oklahoma CDL general knowledge test follows the federal model: 50 questions, 40 correct to pass. Endorsement tests are shorter: air brakes 25, hazmat 30, and combination vehicles, tanker, doubles/triples, passenger and school bus 20 each.

What is the passing score on the Oklahoma CDL permit test?

80% on every knowledge test, the same pass mark used across the United States.

Where do I take the CDL knowledge test in Oklahoma?

Service Oklahoma gives the test. Written test taken in person; most locations offer walk-ins and appointments The test content itself comes from the FMCSA CDL manual.

Does PassRig have Oklahoma CDL practice questions?

Yes. Pick Oklahoma in the app and you get practice sets and mock exams built from the knowledge test content your state uses, with the real counts and the 80% line.