UniGeniusCDL test

Prepare for your CDL knowledge tests one section at a time.

Find your weakest area in a free 20-minute practice test across general knowledge, air brakes and combination vehicles, fix it with a short lesson, then sit full timed practice tests.

The only interactive course with a tutor that finds your weak spots and fixes them.

Take the free practice test

One payment in US dollars. Full refund within 14 days, for any reason.

Three tests, one manual

Every state builds its CDL knowledge tests from the same manual, and each test is passed at 80%. A Class A applicant usually takes all three.

General knowledge Every applicant · 50 questions in our practice tests

Inspection

Pre-trip, en-route and post-trip checks: tires, brakes, steering, suspension, lights and emergency equipment.

Control and seeing

Starting, backing, shifting, mirrors, signals and letting other drivers know you are there.

Speed and space

Stopping distance, following distance, curves, space around the vehicle and spotting hazards early.

Road conditions

Night, fog, winter and hot weather, railroad crossings and long mountain downgrades.

Emergencies

Steering and braking to avoid a crash, ABS, skids, warning devices after a crash and fires.

Rules and cargo

License classes, the learner's permit, disqualifications, alcohol, hazmat basics and securing cargo.

Air brakes To drive with air brakes · 25 questions in our practice tests

Air brakes

How the system builds pressure, dual systems, the air brake check and braking with air.

Combination vehicles For Class A · 20 questions in our practice tests

Combination

Rollover and crack-the-whip, trailer air lines and valves, coupling, uncoupling and inspection.

In Texas, a Texas Commercial Rules test comes first. Free Texas rules practice

Start with a free 20-minute practice test

15 questions from all three tests, no signup. You get your score by area, a short lesson on the weakest one and a study plan.

Take the free practice test

Try a few questions

Question 1

A tire on the front axle of your truck measures 3/32 inch of tread in one major groove. Is it acceptable?

Question 2

You drive a 40-foot straight truck at 35 mph on a city arterial. Under the handbook, what is the least following distance you should keep?

Question 3

Air is slowly leaking from a straight truck's brake system. In what pressure range will the spring brakes come fully on?

Question 4

You make a right turn pulling two trailers. Which wheels off-track the most?

In the course

  • 25 interactive lessons
  • 198 practice questions
  • 2 full practice tests: general knowledge, air brakes and combination

See the course

State notes

The tests are the same everywhere; the extras differ. Read what your state adds, from its own handbook.

Guides

Commercial Driver Genius Pro

US$24one payment

  • 25 interactive lessons
  • 198 practice questions
  • 2 full practice tests

Full refund within 14 days. Ask within 14 days of paying, for any reason. Our refund promise still applies after you start the course. The note under the pay button is about the separate legal right to cancel. Terms

By paying you agree to our Terms. Email us within 14 days for a full refund.
Take the free practice test first

Apple Pay, Google Pay or card. Charged in USD.
One payment. No sales tax is added. Access until October 31, 2027.

Questions? support@unigenius.co.uk