2026 EDITION

CDL practice test: pass first try.

1,600+ CDL questions, all eight knowledge tests, pre-trip inspection

Or buy on the web, then open the link on the iPhone with DriveDrill to unlock it. Handy when a parent pays.

Weekly plan or pay once

Pass Guarantee: pass your knowledge test or get your money back. Conditions apply.

The eight CDL knowledge tests in DriveDrill: General Knowledge, Air Brakes, Combination Vehicles, Hazardous Materials, Tanker, Doubles/Triples, Passenger and School Bus.

Every answer explained
English & Spanish
No account. Works offline.

Studying for your commercial driver's license? DriveDrill's CDL prep has 1,600+ practice questions, written from the national CDL manual and checked against its text, with an explanation on every answer. It covers General Knowledge, the other seven CDL knowledge tests, and the pre-trip inspection.

The eight CDL knowledge tests

Each test has its own practice exam, scored at 80%: the federal passing score for every CDL knowledge test (49 CFR 383.135). The number of questions on the real test varies by state.

General KnowledgeThe test everyone takes.
Air BrakesIf your vehicle has air brakes.
Combination VehiclesFor combination vehicles, like a tractor-trailer.
Hazardous MaterialsThe H endorsement, to haul hazardous materials.
TankerThe N endorsement, to haul liquids or gases in tanks.
Doubles/TriplesThe T endorsement, to pull double or triple trailers.
PassengerThe P endorsement, to drive a bus.
School BusThe S endorsement, to drive a school bus.

Pre-trip inspection

A step-by-step checklist for both versions of the vehicle inspection test, with "what you might say" examples, and a quiz to check yourself.

Diagrams that teach

The air brake gauge and the air system.
The fifth-wheel coupling check.
The walk-around route for the inspection.
Every hazmat placard, from the U.S. DOT's own artwork.

Also in Spanish

The CDL questions, answers and explanations are also in Spanish: la CDL en español. Some states give the CDL knowledge test only in English, so check with your state's licensing agency before test day.

How CDL is sold

CDL: CDL Weekly $9.99, 3-day free trial · CDL Full Access $35.99 - Paid Once - No Subscription

CDL is a separate purchase from car permit Full Access: CDL does not include car permit practice, and car Full Access does not include CDL.
The weekly plan starts with a free trial and renews each week until you cancel it.
Prefer not to subscribe? The one-time CDL Full Access never renews.
Current prices are shown in the App Store and in the app before you buy.

Practice all eight CDL knowledge tests and the pre-trip inspection in the app.

Weekly plan or pay once

Also in DriveDrill: car permit practice tests for all 50 states and motorcycle prep.

DriveDrill is an independent study app. It is not affiliated with, endorsed by, or connected to the FMCSA or any state motor vehicle agency. CDL practice questions are written in the style of the CDL knowledge tests and are not official test questions. Your state's current CDL manual is always the authoritative source.