The Arizona endorsement test covers the specific skills and knowledge for the endorsement you're seeking

Arizona's endorsement test is a written exam administered by the Arizona Department of Transportation (ADOT). The test you take depends on which endorsement you want — Hazmat (H), Passenger (P), Tanker (T), Doubles/Triples (D), or School Bus (S). Each test is separate, and you can pursue multiple endorsements.

The test is given at an ADOT office or approved third-party testing location. You'll answer multiple-choice questions on a computer or paper, depending on the location. The number of questions and passing score varies by endorsement type. You must pass the written test before you can take the skills test (if required for that endorsement).

Key Takeaways

  • Each Arizona endorsement has its own written test covering rules, safety, and equipment specific to that endorsement type.
  • You must pass the written test before scheduling a skills test for endorsements that require one (Passenger, School Bus, and Doubles/Triples).
  • Study materials are available free from ADOT, including the CDL manual and endorsement-specific sections.
  • You can take multiple endorsement tests in one visit to an ADOT office, but each test costs a separate fee.
  • Hazmat endorsement requires a Transportation Security Administration (TSA) background check in addition to passing the written test.

What each endorsement test covers

Hazmat (H) tests your knowledge of hazardous materials regulations, placarding, loading and unloading procedures, and emergency response. You'll answer questions about what materials require placards, how to transport them safely, and what to do if a spill occurs. This endorsement also requires TSA clearance, which involves a background check and fingerprinting at an approved location.

Passenger (P) covers vehicle safety checks specific to buses, passenger seating and safety equipment, loading procedures, and emergency evacuation. The test includes questions about mirror checks, brake systems, and how to handle passenger behavior and medical emergencies.

Tanker (T) focuses on the physics of liquid cargo, tank safety features, loading and unloading procedures, and how to drive a tanker safely. Questions cover surge and slosh (how liquid moves inside the tank), proper braking, and turning at different speeds with a full or partial load.

Doubles/Triples (D) tests your knowledge of coupling and uncoupling procedures, weight distribution, braking with multiple trailers, and how to handle the longer vehicle. You'll answer questions about proper hookup sequences, air brake systems across multiple units, and turning radius.

School Bus (S) covers pre-trip inspections for school buses, student safety procedures, loading and unloading in traffic, and how to handle emergency situations involving children. The test includes questions about stop arm procedures, crossing procedures, and communication with students.

How to study for the Arizona endorsement test

ADOT provides the Arizona CDL Manual free online at the ADOT website. The manual contains a general section on CDL rules and a dedicated section for each endorsement. Read the endorsement section that matches what you're testing for — do not rely on the general section alone.

Many people study by reading the manual once, then taking practice tests. Practice tests help you identify weak areas and get used to the question format. Some third-party websites and apps offer practice questions, though ADOT does not officially endorse any of them. The questions on the real test will not be identical to practice questions, but they cover the same topics.

If you're pursuing multiple endorsements, study one at a time rather than all at once. Each endorsement has different rules and procedures, and mixing them up during the test is a common mistake.

Test fees and scheduling in Arizona

Each endorsement test costs a fee set by ADOT. The fee varies slightly depending on whether you test at an ADOT office or a third-party location. You can schedule your test online through the ADOT website or by calling an ADOT office. Some locations allow walk-ins, but scheduling in advance is faster.

You must bring your current Arizona driver's license or ID, and proof of Arizona residency if your ID does not show your current address. If you're testing for Hazmat, you'll also need to show proof of TSA clearance before you can take the written test.

Test results are usually available when ready after you finish. If you pass, ADOT will add the endorsement to your license within a few business days. If you fail, you can retake the test, but you'll need to pay the fee again.

Passing score and retake rules

The passing score for most endorsements is 80 percent. For School Bus, the passing score is also 80 percent. You must answer enough questions correctly to reach that threshold — there is no partial credit.

If you fail an endorsement test, you can retake it the same day at most ADOT locations, though you'll pay the fee again. There is no waiting period between attempts in Arizona. Some people fail because they rushed through the test or did not study the endorsement-specific material thoroughly enough. Taking time to read each question carefully and reviewing the manual again before a retake usually helps.

Endorsements that require a skills test after the written test

Passing the written test is only the first step for Passenger, School Bus, and Doubles/Triples endorsements. After you pass the written test, you must schedule and pass a skills test with an ADOT examiner or approved third-party tester. The skills test includes a pre-trip inspection, basic control test, and road test specific to that endorsement.

Hazmat and Tanker endorsements require only the written test and TSA clearance (for Hazmat). You do not take a separate skills test for these endorsements, though your general CDL skills test must have been passed before you can add them.

Common mistakes on the Arizona endorsement test

Many test-takers fail because they study the general CDL manual but skip the endorsement-specific sections. The endorsement test is not a repeat of the general knowledge test — it focuses on rules and procedures unique to that endorsement. Reading only the general section will leave you unprepared.

Another common mistake is not understanding the "why" behind the rules. For example, Tanker questions often ask why you must brake differently with a full tank versus an empty one. If you memorize that you must brake differently but do not understand surge and slosh, you'll struggle with scenario-based questions.

Some people also fail because they do not read the questions carefully. A question might ask "which of the following is NOT required" rather than "which is required." Missing that word changes the correct answer entirely.

Frequently Asked Questions

Can I take multiple endorsement tests on the same day?

Yes. You can take as many endorsement tests as you want in one visit to an ADOT office, though you'll pay a separate fee for each test. Many people test for two or three endorsements at once if they've studied for all of them. Schedule all tests when you book your appointment.

Do I need to pass the general CDL knowledge test before taking an endorsement test?

Yes. You must have a valid CDL before you can add an endorsement. If you're still working on your CDL, pass the general knowledge test and skills test first, then come back for endorsements.

What happens if I fail the endorsement test?

You can retake it the same day or schedule another appointment. There's no waiting period in Arizona. You'll pay the test fee again. Review the endorsement section of the manual and focus on the topics you found hardest before your next attempt.

Is the Hazmat endorsement test harder than the others?

Hazmat has more detailed regulations to learn, but the passing score is the same as other endorsements (80 percent). The main extra step is the TSA background check, which happens separately from the test itself. Study the Hazmat section thoroughly and you can pass it like any other endorsement.

Can I study for the endorsement test using only practice questions?

Practice questions help, but you should read the endorsement section of the Arizona CDL Manual first. Practice questions show you what topics appear on the test, but the manual explains the "why" behind the rules. Using both together gives you the best chance of passing.