What subjects are covered?

General Knowledge, Air Brakes, and Combination Vehicles, plus endorsement and pre-trip practice in the CDL lab.

CDL knowledge

Free California CDL practice test

Q: Are these official California DMV CDL questions?

No. These are original practice items modeled on the public California Commercial Driver Handbook. Only the DMV issues a CDL.

Study General Knowledge, Air Brakes, and Combination Vehicles before you sit at the DMV. Original items modeled on the public California Commercial Driver Handbook — not official DMV questions. Paying here does not pass you and does not skip the DMV.

Who it is for: permit students and commercial-driver applicants. What it covers: handbook-based knowledge practice, including air brakes fundamentals and combination vehicles.

Start the CDL knowledge lab

Topic quizzes: General Knowledge · Air Brakes · Combination Vehicles

Educational-use notice: This material is for general educational and study purposes only. It is not official DMV or licensing training. It does not provide a license or guarantee of passing. Verify current requirements with the California DMV. Full disclaimer · See an error? Tell us.

Common questions

Are these official DMV questions?

No. Original handbook-style practice. Only the California DMV issues a CDL and administers the official tests.

What should I study first?

Start with General Knowledge, then Air Brakes and Combination Vehicles.

Official source

California Commercial Driver Handbook · California CDL information. Last reviewed: August 31, 2026.

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