Oklahoma (OK) CDL Practice Tests

Oklahoma (OK) CDL permit applicants can work through these five practice questions to review core exam concepts and prepare for the Commercial Learner’s Permit (CLP) knowledge test.

Oklahoma CDL Practice Tests: General Knowledge, Combination Vehicle & Air Brakes

Drivers preparing for an Oklahoma Commercial Driver’s License (CDL) should focus on three core CDL practice tests. These align with the written knowledge exams required in Oklahoma and support the material covered in the official Oklahoma CDL manual.

• General Knowledge CDL Practice Test
• Combination Vehicle CDL Practice Test
• Air Brakes CDL Practice Test

For best results, combine CDL practice tests with the Oklahoma Commercial Driver License Manual and focus on the sections that match your intended license class and endorsements.

Preparing for the Oklahoma CDL Exam

Commercial driver licensing standards are established at the federal level by the Federal Motor Carrier Safety Administration (FMCSA). Each state is responsible for administering CDL testing and licensing.

In Oklahoma, CDL information and testing requirements are published by Service Oklahoma, which now administers commercial driver licensing statewide. The official CDL manual used for written and skills testing is:

• Oklahoma Commercial Driver License Manual (PDF)

The Oklahoma CDL manual applies to all commercial license classes, including:

• Class A CDL
• Class B CDL
• Class C CDL

Oklahoma CDL Eligibility Requirements

Age Requirements:
You must be at least 18 years old to operate a commercial motor vehicle within Oklahoma (intrastate).
You must be at least 21 years old to operate interstate or transport hazardous materials.

Valid Oklahoma Driver’s License

You must hold a valid Oklahoma Class D non-commercial driver’s license before applying for a CDL.

Medical Certification

All Oklahoma CDL applicants must pass a DOT physical examination conducted by a certified medical examiner listed on the National Registry.

FMCSA medical certification requirements

CDL Knowledge Tests and Endorsements

Applicants must pass written knowledge tests covering general CDL topics, air brakes (if applicable), and any endorsements required for their intended type of driving.

Common CDL endorsements include:

• Hazardous Materials (H)
• Tank Vehicles (N)
• Passenger (P)
• School Bus (S)

Entry-Level Driver Training (ELDT)

Federal Entry-Level Driver Training (ELDT) requirements apply to many Oklahoma CDL applicants. ELDT includes classroom instruction and behind-the-wheel training completed through an FMCSA-registered provider.

ELDT is required for:

• First-time CDL applicants
• Drivers upgrading from Class B to Class A
• Applicants adding Hazardous Materials (H), Passenger (P), or School Bus (S) endorsements

FMCSA Training Provider Registry

Background Checks and Documentation

Certain endorsements, including Hazardous Materials, require a federal background check. Applicants must also provide documentation verifying identity, Oklahoma residency, and lawful U.S. presence.

Oklahoma CDL Application Process

CDL applicants in Oklahoma must complete knowledge testing, obtain a Commercial Learner Permit (CLP), complete any required Entry-Level Driver Training, and pass the CDL skills test before license issuance.

Service Oklahoma CDL application and testing steps

Oklahoma CDL Fees

Oklahoma CDL fees are published by Service Oklahoma. Fees vary based on license class and testing requirements.

• CLP/CDL Application Fee (Class A): $25.00
• CLP/CDL Application Fee (Class B or Class C): $15.00
• CDL Credential Fee (4-year, Class A or B): $56.50
• CDL Credential Fee (4-year, Class C): $46.50

Additional Oklahoma CDL Fees:

• Written or Skills Test Retake (per failed section): $4.00
• Added Endorsement Application Fee: $4.00

Oklahoma does not charge a separate skills test fee; the pre-trip inspection, basic control skills, and road test are included in the application/credential fee. Additional costs may also apply for endorsement testing or background checks, such as TSA fingerprinting for Hazardous Materials endorsements.

View the official Service Oklahoma fee schedule