Washington CDL practice test
Published Updated Licensing sources checked:
How do I prepare for the Washington CDL knowledge test?
If you are preparing for your first permit, start with general knowledge and the official Washington instructions below. If your vehicle needs air brakes or combination vehicles, add those federal study sets; for hazardous materials, use the separate hazmat set. Compare the state’s published test rules with its current manual before you test. These practice sets teach federal topics and do not copy the state exam.
This page is study material. It is not the Washington state exam, and it does not copy state test questions. Check the official Washington pages below before you test.
| Your situation | Start with… |
|---|---|
| A quick first try | Take a 10-question warm-up |
| Ready for a longer attempt | Take the 50-question general knowledge exam |
| Need state rules or documents | Check the Washington application steps |
Washington commercial driver guide (PDF) — link checked . Study its rules alongside our federal-standard bank. Our 50-question exam length is a study setting; use the official counts below for Washington.
Washington DOL’s CDL knowledge-test page checked November 10, 2026 prints question counts and correct-answer passing scores for each test below. Read these alongside the Commercial Driver Guide. Our federal study sessions are separate learning tools and do not copy the Washington exam.
Which tests do I need in Washington?
| Your vehicle or work | Required study and tests |
|---|---|
| All permit applicants | Start with general knowledge. Official requirements. Federal warm-up · Federal exam mode |
| Class A combination vehicle | Add combination vehicles. Official requirements. Federal warm-up · Federal exam mode |
| Vehicle with air brakes | Add air brakes and check restriction rules. Official requirements. Federal warm-up · Federal exam mode |
| Passenger vehicle | Add the passenger endorsement tests. Official requirements. Federal warm-up · Federal exam mode |
| School bus | Study school bus and passenger topics; check state testing requirements. Official requirements. Federal warm-up · Federal exam mode |
| Tank vehicle | Add the tank vehicle knowledge test. Official requirements. Federal warm-up · Federal exam mode |
| Hazardous materials | Add the hazmat knowledge test and check approval and training steps. Official requirements. Federal warm-up · Federal exam mode |
| Doubles or triples | Add the doubles and triples knowledge test. Official requirements. Federal warm-up · Federal exam mode |
DOL requires the tank knowledge test before issuing a CLP if you will train or take the skills test in a commercial tank vehicle. Check its current non-domicile testing notice before booking.
Before booking the exam, check Washington CDL application steps and official fee lines.
| Test | Questions | To pass | Official source |
|---|---|---|---|
| General knowledge | 50 questions | 40 correct | State source |
| Combination vehicles, for Class A | 20 questions | 16 correct | State source |
| Air brakes, if applicable | 25 questions | 20 correct | State source |
| Passenger | 20 questions | 16 correct | State source |
| Tank vehicle | 20 questions | 16 correct | State source |
| School bus | 20 questions | 16 correct | State source |
| Hazardous materials | 30 questions | 24 correct | State source |
| Doubles and triples | 20 questions | 16 correct | State source |
Washington language, permit and booking notes — checked 2026-11-10
Book the knowledge test at a driver licensing office that offers testing. DOL says the test fee covers one attempt at each knowledge test taken within 90 days of the receipt; this page does not print the dollar amount. Official source — checked .
The knowledge test is offered in English, Spanish, Russian and Serbian–Croatian. Language interpreters are not allowed. Official source — checked .
DOL’s checked page says non-domicile CLP and CDL transactions, including knowledge and skills testing for non-domiciled drivers, have stopped. Check the current notice before booking. Official source — checked .
For unknown figures, check with the Washington licensing agency. A blank count is not an estimate.
Federal study sets, not the Washington exam
Use general knowledge, air brakes, combination vehicles, and hazmat to study the federal topics. Finishing one of those sets does not mean you passed the Washington test.