Free CDL Practice Tests - All Endorsements

Yes, though a lot of the core CDL material is standardized across the country. Federal regulations set the minimum rules for CDL classes, endorsements, restrictions, and testing, but each state licensing agency runs its own program. That means manuals, application steps, traffic laws, fees, and even testing arrangements can vary from one state to another.

Choosing your state helps match the practice material to the wording and information used in your current state CDL manual.

The right CDL practice test comes down to the vehicle you plan to drive, its weight, and any endorsements the job requires.

Class A applies to combination vehicles with a gross combination weight rating or actual weight of at least 26,001 pounds when the towed unit is rated or weighs more than 10,000 pounds. Tractor-trailers are the familiar example.

Class B applies to a single vehicle rated or weighing at least 26,001 pounds, including one towing a vehicle that does not exceed 10,000 pounds. Straight trucks, large buses, and dump trucks may fall into this category.

Class C covers vehicles outside the Class A and B definitions that are designed to carry at least 16 people, including the driver, or transport certain hazardous materials.

A Class A applicant will generally need combination-vehicle material. Air-brake and endorsement topics depend on the actual vehicle and work involved, which is where the details start to matter.

Begin with General Knowledge. Applicants must pass the applicable General Knowledge test before receiving a commercial learner’s permit, or CLP, and it covers the material everything else tends to build on—vehicle inspections, safe control, speed and space management, cargo safety, emergencies, and driver responsibilities.

Once that foundation is in place, move into the sections required for your vehicle. A Class A applicant may need Combination Vehicles, while anyone planning to operate an air-brake-equipped vehicle should study Air Brakes. Endorsement tests may also be required. In some states, several of these tests can be handled during the same appointment, so it is worth being prepared for more than one.

Yes. NextDoorDriving offers free, dedicated practice tests for the major CDL endorsements: Double/Triple Trailers (T), Passenger (P), Tank Vehicle (N), Hazardous Materials (H), and School Bus (S). Applicants who qualify for both tanker and hazardous-materials operation may receive an X endorsement after meeting both sets of requirements.

The T, N, and H endorsements involve specialized knowledge testing. Passenger and School Bus go further, requiring both knowledge and skills tests. First-time hazardous-materials applicants must also complete any applicable Entry-Level Driver Training and meet federal Transportation Security Administration requirements. CDL practice tests prepare you for the knowledge portion—they do not replace training, skills testing, or the required security screening.

Air Brakes is not an endorsement. It is a separate, specialized knowledge area, and applicants testing in vehicles equipped with air brakes must also show that they can inspect and operate the system during the skills test.

Failing the air-brake knowledge component, or taking the skills test in a vehicle without air brakes, will generally lead to an L restriction, which bars you from operating a commercial vehicle equipped with air brakes. Testing in a vehicle with air-over-hydraulic brakes results in a Z restriction, meaning you cannot operate vehicles with full air brakes. The practical takeaway is fairly simple, although it is easy to overlook: test in a representative vehicle with the brake system you actually expect to use.

You must pass the applicable General Knowledge test to qualify for a commercial learner’s permit, but the required tests do not always have to be taken on separate visits. Depending on state procedures, General Knowledge, vehicle-class, air-brake, and endorsement knowledge tests may all be available during the same appointment.

Passenger, School Bus, and Tank Vehicle are the endorsements allowed on a CLP, and the required knowledge tests must be passed before those endorsements can appear on the permit. Scheduling, retesting, and the rest of the process are handled by the state, though, so check your current state CDL manual before the appointment rather than assuming the procedure is the same everywhere.

NextDoorDriving’s 2026 practice questions are built around subjects covered in official state CDL manuals and federal safety standards. They are also reviewed by professional driving instructors with decades of teaching experience. The goal is to reinforce the concepts, general format, and level of understanding expected from applicants—not merely to help you memorize a string of answers.

They are not official examination questions, even though they may be extremely close, and identical wording or a specific question should never be assumed. States can use different test forms, question sets, and answer orders. Treat your results as a diagnostic tool: find the areas where you hesitate or miss questions, then go back to those sections in your current state CDL manual.

That depends on the state giving the exam. Federal standards say a basic CDL knowledge test must include at least 30 questions, though many states use a 50-question General Knowledge test. Endorsement exams are separate and usually shorter, but, again, the exact length depends on the state and the endorsement involved. Your state’s current CDL manual or licensing-agency website is the place to confirm the number for every test you plan to take.

You need to answer at least 80% of the questions correctly on each CDL knowledge test, including General Knowledge and any endorsement exams. On a 50-question test, that means getting at least 40 answers right. The exams are scored separately, which matters—a passing General Knowledge score will not make up for a failed endorsement test.

The exact paperwork varies by state, but most applicants will need a current driver’s license, proof of age and identity, proof of citizenship or lawful permanent-resident status, and documents showing the state is their state of domicile. The licensing agency will also verify the applicant’s Social Security number and ask about every state where the applicant held a driver’s license during the previous 10 years.

Applicants also have to self-certify the type of commercial driving they intend to do. Anyone planning to operate in non-excepted interstate commerce must be examined by a certified medical examiner. Since June 23, 2025, that medical certification information is generally sent to the state electronically, although applicants should still follow their state agency’s instructions about what, if anything, they need to bring in person.

Your CLP and CDL generally have to come from your state of domicile—the state where you maintain your primary residence and driver’s license. An out-of-state applicant may sometimes take the General Knowledge test elsewhere, such as while attending driver training, but only when the testing state has an agreement with the applicant’s home state and can securely transfer the results.

Not every state participates in that kind of arrangement. So, no, you should not assume an out-of-state testing location can issue your permit. Confirm the process with your home-state licensing agency before scheduling the exam somewhere else.

There is no single study period that works for everyone. Many applicants prepare for one to three weeks, but the realistic answer depends on your commercial-driving experience, the CDL class you are pursuing, and whether you need endorsements for air brakes, tanker vehicles, passengers, hazardous materials, or something else.

Work through your state’s current CDL manual in short, regular sessions, then use CDL practice tests to expose the areas you still do not understand. A strong practice score is a useful sign that you may be ready—it is not a guarantee, though, because practice questions are not live questions from the official state exam.

You can retake a failed CDL knowledge test, but the waiting period, fees, appointment requirements, and any limits on attempts are set by the state. Federal rules also require the state to give you a different version of the exam when you retake a test you previously failed.

The tests are normally handled separately. In practical terms, if you pass General Knowledge but fail an endorsement exam, you will generally retake that endorsement rather than start over with every exam. Still, check your state licensing agency’s retesting policy before you return—those details are not identical everywhere.

There is no universal list because the hardest material changes with the applicant, CDL class, endorsement, and state exam. That said, people often need more work on air-brake warning devices and system operation; combination-vehicle coupling, trailer air lines, and rollover prevention; hazardous-material placards and loading rules; and safe speed, following distance, stopping distance, and night-driving practices.

Do not rely on memorizing disconnected answers. Understand why each rule or procedure matters, then go back through the parts of your state CDL manual that apply to your vehicle and endorsements. Practice-test results can help narrow it down—they tend to make weak spots fairly obvious.

Yes. Every CDL practice test on NextDoorDriving is free, and you can take the tests as many times as you need. There are no paywalls, hidden fees, or locked test modules. The questions are designed to reinforce material covered in CDL manuals and help with preparation, but they are not official questions pulled from a live state exam.