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10 Things You Should Do Before Your CDL Knowledge Exam

Many people get to the DMV overconfident and underprepared because they fail to do some of the simple things that would allow them to pass easily. What follows are the 10 steps that every aspiring commefcial driver should take to prepare for his or her official CDL or CLP knowledge exam.

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CDL Classes and Endorsements Overview (October 2021):

As you earn your Class A, Class B or Class C CDL, you can also earn endorsements. Endorsements allow you to drive certain vehicles or groups of vehicles such as single or combination trucks, tankers, doubles, school buses and passenger vehicles. The more endorsements you hold, the greater your chances to make more money and advance your career. You'll need to pass a separate knowledge exam and/or road exam for each endorsement you want to get. Learn more about CDL endorsements and restrictions.

Type of EndorsementCodeDescriptionRequired test(-s)
CDL General Knowledge Test-Even though technically it's not an endorsement, it's the first of several tests that you will have to complete in order to get your CDL. Includes questions on road signs, traffic laws, safe driving practices, vehicle equipment, and other important topics.Knowledge test
CDL Air Brake TestA (L Restriction Removal)If your CDL application requires an air brake endorsement, you will need to pass an air brakes test. This test will test your knowledge of air brakes and other vehicle components and systems.Knowledge test
CDL Combination TestXThis Combination endorsement covers both Tanker and Hazardous Materials.Knowledge test
CDL Doubles and Triples TestTIf you want to operate a vehicle with more than one trailer attached (doubles or triples), you will need to pass a doubles and triples test.Knowledge test
CDL HazMat TestHThis test covers all you need to know about driving vehicles that can carry hazardous materials, such as poisonous liquids or materials, explosives and radioactive materials.Knowledge test
CDL School Bus TestSThis endorsement allows you to transport students in a full-sized school bus.Prior to obtaining an S endorsement, a P endorsement must be earned.Knowledge test and road test
CDL Tank TestNThis endorsement allows you to aperte a tank vehicle (a vehicle that transports liquids or gasses in bulk.)Knowledge test
CDL Passenger TestPThe P endorsement is needed to operate a vehicle that seats 16 or more people, including the driver.Knowledge test and road test

Practice on the go and offline with our CDL Genie app:

CDL License
A commercial driver’s license (CDL) is a driver’s license that authorizes a person to operate a class of commercial motor vehicles (CMVs). Federal standards define three classes of CDLs, each for a corresponding group of motor vehicles:
  • Class A (Combination Vehicles): Any combination of vehicles with a gross combination weight rating (GCWR) of at least 26,001 pounds provided the gross vehicle weight rating (GVWR) of the vehicle(s) being towed exceeds 10,000 pounds. Examples include tractor-trailers.
  • Class B (Heavy Straight Vehicles): Any single vehicle with a GVWR of at least 26,001 pounds, or any such vehicle towing another vehicle whose GVWR does not exceed 10,000 pounds. Examples include coach buses and transit buses.
  • Class C (Small Vehicles): Any single vehicle or combination of vehicles not included in Class A or Class B that is used to transport sixteen or more passengers including the driver or to transport hazardous materials. (For this purpose, federal regulations define a hazardous material as a substance that has been designated by the US Secretary of Transportation as a material whose commercial transportation may pose an unreasonable risk to health and safety or property.) Examples include sixteen-passenger vans.
Some US states also require CDLs for other purposes or other types of vehicles. Like other types of driver’s licenses, CDLs are usually issued by a state government’s DMV. In other respects, a CDL functions like an ordinary driver’s license. It can be used as a valid form of identification. The holder of a CDL may legally drive a passenger car or obtain a motorcycle endorsement on the CDL.
Obtaining a CDL
  • You must be at least 18 years old.
  • Have a valid driver's license (or learner permit) for the state in which you are applying.
  • Pass the CDL written knowledge test.
  • Complete your medical exam and get your physical.
  • Get fingerprinted by law enforcement with ID verification, or go to an authorized third-party vendor that provides computerized fingerprinting services.
  • Go to a DMV office and pay the required fee to take the skills test

What Are All the Truck Parts Called?

CDL Test Questions and Answers: What To Expect?

  1. Study your state's CDL handbook. Sometimes it's hard to find the official source, so we've put together a list of the most recent official CDL handbooks for every U.S. state. If you prefer a hard copy, you should be able to pick one up at your local DMV office.
  2. Take a lot of practice tests. Taking practice tests that simulate your state's actual knowledge test will give you confidence and prepare you for the actual thing. Our CDL test questions are based on your state's official manual, so you'll know what to expect. These tests are valid for both commercial driver license and CDL permit (CLP).
  3. Watch CDL videos. YouTube is a fantastic resource, especially for pre-trip inspection.

Apply for a Commercial Driver's License (CDL)

A Commercial Driver's License is required to drive commercial vehicles such as tractor trailers, semi-trucks, dump trucks, and passenger buses (including school buses). The minimum age to apply for a CDL is typically 21. To become a truck driver, you can apply for a CDL at a local DMV office. Learn more about the three classes of CDLs that determine the kinds of commercial motor vehicles you’re permitted to drive: Class A, Class B, and Class C. There are strict federal guidelines for obtaining a CDL, and each state has its own requirements that need to be also met. You must pass both a written knowledge exam and a driving skills test, which are designed by your state.

CDL Written Knowledge Test

Your CDL test is the first step to a professional truck driving career in a trucking company. After you've studied your state's CDL handbook, the best thing you can do is either sign up for a costly CDL training program or take a free CDL practice test that simulates your state's actual knowledge test. provides a general knowledge test, as well as practice tests for specific commercial vehicle endorsements, such as air brakes test, school bus, and hazardous material (HazMat endorsement). There's also a practice test for pre-trip inspection - it will come in handy before your CDL road test. These tests are valid for both commercial driver license and CDL permit (CLP).

Choose your state from the drop-down menu above, and you’ll be provided with a test for all CDL license types that is closely based on your state’s manual, state and federal laws, and practice questions provided by the state if available.

How Is the CDL Practice Test Structured?

Think of this as your own CDL study guide for each endorsement. Every practice test has multiple-choice questions in the same format you’ll find on your state’s CDL test. These questions are phrased like the ones on your state’s official knowledge test. Most of the questions come with a hint to help you choose the right answer. Each correct answer comes with an explanation that has been carefully written to help you become more familiar with the topic of the question. We want you to be able to answer questions on those topics correctly even if they are worded a bit differently. Please read each explanation; it is based on your state’s CDL manual and DMV/DOT website.

Which Topics Are Covered?

This practice exam covers a wide range of topics that you’ll need to know about to pass your CDL knowledge test and enter the trucking industry. These topics include aggressive drivers, braking techniques, cargo safety, distracted drivers, drunk driving laws, emergency preparedness, road and weather conditions, and safe backing. No, we certainly did not forget about air brakes, combination vehicles, or hazardous materials! These topics are complex enough to deserve separate treatment. Just as states typically require you to pass specialized knowledge tests on those topics, we offer our own specialized practice tests on air brakes, combination vehicles, and hazardous materials. By studying our CDL practice tests, you'll be on your way to obtaining your Class A CDL, Class B CDL, or Class C CDL license. Remember that you'll also need to fill out the Medical History portion of the MER form (MCSA-5875) and also obtain a copy of the Medical Examiner Certificate form (MCSA-5876).

How Many Times Should I Take the CDL Practice Test?

We recommend that you keep taking the test until you become fully comfortable with the subject matter and receive a score high enough to boost your confidence about your upcoming CDL exam. A high score will bring you closer to passing your CDL knowledge test, so practice as many times as you’d like. There are no fees, and you won’t even have to register. Good luck now and on your CDL test. Drive safely!

Start preparing for your 2021 CDL test now, for free.

Select Your State


To get your Commercial Driver License (CDL), you need to pass the vision test, knowledge test, and a road test.


  • For help preparing for the knowledge test, see the CDL manual.
    • CDL manuals are also available at a motor vehicle agency or by calling the MVC’s Customer Support Line at (609) 292-6500  weekdays (except holidays) from 8:30 a.m. to 4:15 request a copy by mail.

CDL knowledge test

Below is a bullet point outline of the Exam Test Receipt and Commercial Learner Permit Process.  The points are listed in a manner that will assist you in the process to obtain a CDL.

  • Make an appointment to get a permit, and bring your 6 Points of ID to obtain a Test Receipt.
  • To be sure that you get the correct tests you must indicate the type of commercial vehicle you will drive and the endorsement(s) you will use.
  • The test fee is $125.
  • Visit a Driver Testing Center (DTC) to take any needed knowledge exams and vision test. DTC’s are at the following locations: Bakers Basin, Bayonne, Camden, Cardiff, Eatontown, Edison, Freehold, Lodi, Mount Holly, Newark, Newton, North Bergen, Paterson, Rahway, Randolph, Rio Grande, Runnemede, Salem, South Plainfield, Toms River, Vineland, Washington, Wayne, or West Deptford.
  • The knowledge test is a 50-question general test with additional separate tests for each endorsement.  To pass the test you must answer at least 80% of the questions correctly.
  • Pass the knowledge exams and have the Test Receipt validated at the DTC.
  • Take the validated Test Receipt and present it along with the CDL Holder Self-Certification Form and a valid Medical Examiner’s Certificate, if required to a motor vehicle agency to receive your Commercial Learner’s Permit(CLP).
  • Return to a DTC to have the CLP validated.
  • You will need to practice for 14 days accompanied by another CDL licensed person before you can take the road test.
  • You should have a current and validated CLP present whenever practicing for the skills test.  The Test Receipt does not have to be present when practicing. 
  • Test scores are valid for 360 days.

 If you fail the knowledge test you must wait seven days before taking it again. You may re-take the test as many times as you like, but if you have not passed it after 180 days, you will need to renew your Test Receipt.

CDL road test

All CDL Applicants are required to take the CDL road test. You can schedule an appointment for a CDL road test 14 days after you successfully complete the knowledge test. Appointments are scheduled at any DTC.  A safety specialist will ride with you and judge you on three parts:

  • Pre-trip
  • Basic Skills
  • Road Skills

CDL Road Test Sites

  • Bakers Basin
  • Cherry Hill
  • Delanco
  • Eatontown
  • Lodi
  • Rahway
  • Randolph
  • Wayne
  • Winslow

Make sure you bring these items to the road test:

  • A vehicle with the following:
    • Current inspection sticker.
    • Valid registration.
    • Valid insurance card (unless covered by PUC or federal DOT regulations).
    • Legible GVWR placards affixed to the test vehicle(s).
    • Empty of cargo of any kind.
  • Valid Test Receipt and CLP.
  • Licensed driver qualified to operate the CMV being used for the test.

NoteThe MVC does not supply vehicles for road tests

Once you pass the CDL road test, you may take your permit and authorization slip to a motor vehicle agency to obtain your license.

If you fail the CDL road test, you must wait at least two weeks before re-taking the test. If you fail the test several times, the MVC may require that you wait six months before taking the road test again.

Banking of Commercial Driver License Skills Test Scores

The banking of CDL skills test scores is permissible under the following guidelines:

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Obtaining a Commercial Learner Permit (CLP)


Effective October 1, 2019 the Connecticut DMV will issue a Commercial Learner's Permit (CLP) that is valid for one year from the date of issue. If you do not obtain a Commercial Driver's License (CDL) before the CLP expires, you must retake and pass all knowledge tests again in order to obtain a new permit.

Effective January 1, 2019 there will be a federal criminal history background check fee increase from $12.00 to $13.25 for each Public Service Endorsement applicant.

This fee will be in addition to the $75.00 fee for the State criminal background check for each Public Service Endorsement applicant.


**Effective February 7, 2022 - New Requirement for CDL Entry Level Driving Training.  Click here for details.  


You will be required to provide additional identity documents. If you currently have a non-verified Class D license (i.e., no Gold Star”) you will be required to provide documentation and obtain a verified (“Gold Star”) Class D license prior to the issuance of a CLP. The fee for a duplicate Class D is $30.  Find more information here. 


Getting Started


A Commercial Learner's Permit (CLP) is required for the operation of a commercial vehicle while under the instruction of a licensed CDL operator. 


Select an option below to learn more about the Commercial Learner Permit.

Required Documentation (must be presented when appearing for CDL knowledge testing):

NOTE:  If you are NOT a U.S. Citizen, you will be required to show proof of your legal status in this country.  Please see Acceptable Forms of Identification for Non-U.S. Citizens.


General Knowledge testing:

Once the above documentation is presented and accepted by a DMV representative you will be required to take and pass a general knowledge test depending on the type of commercial motor vehicle you intend to operate. 


Testing is offered by appointment only. Make an appointment at a DMV office. 


The general knowledge test consists of 50 questions (40 correct answers represents a passing score).  In order to prepare for the test, the Connecticut Commercial Driver’s Manual should be studied.


You will not receive a permanent driver license or ID card while at a DMV office.   It will arrive through the mail.  You may retain your expiring license or ID provided there are no changes other than address.  For more on this, please see Central Issuance. After visiting an office, you can track the delivery of your new card.


  General KnowledgeAir BrakesCombinationPassengers
"P" Endorsement
School Bus
"S" Endorsement
 Class A X If equipped X If carrying passengers If driving school bus
 Class B X If equipped  If carrying passengers If driving school bus
Class C X If equipped  If carrying passengers If driving school bus


Endorsement Testing:

In addition to the General Knowledge test if you are requesting to have additional endorsements added to your license you will be required to pass a test for each endorsement you apply for. 

  • The Hazardous Materials Endorsement test has 30 questions (need 24 correct to pass). 
  • The Air Brakes endorsement test has 25 questions (need 20 correct to pass).
  • The Combination Vehicle, School Bus, Passenger, Tanker, and Doubles and Triples endorsement tests have 20 questions (need 16 correct to pass).

NOTE:  If you are applying for a Hazardous Materials Endorsement (H) or Public Passenger Endorsement (S, V, A or F) there are additional requirements that must be met.  Please see additional information Hazardous Materials Endorsements or Public Passenger Endorsements. 


Applicants or holders of a public passenger endorsement must have an acceptable driving record.


 General Knowledge $16
 Air Brakes $5
 Combination $5
 All other endorsements (S-school bus, T-doubles/triples, P-passenger, N-liquid bulk/tank cargo, H-hazardous materials and X-hazardous material and tank, combined) $5 for each endorsement requested
 Skills Test $30 (paid at time of knowledge test)


The skills test fee (on-the -road portion of the test) must be paid when the application for the CLP is submitted.


Failed Knowledge Tests:

If you fail any knowledge tests you must make an appointment to retake the test.  You will be required to complete a new Application for Commercial Driver’s License (DMV Form R-229a) and pay the test fee again.


Passing the General Knowledge and Endorsement Tests:

Once you have passed the required knowledge test(s), you will be required to pay a $10 fee for the issuance of the Commercial Learner Permit (CLP).


CLP - Term

The CLP is valid for a period of one year. If you do not obtain a Commericial Driver's License (CDL) before the CLP expires, you must retake and pass all knowledge tests again in order to obtain a new permit.


CLP - Duplicate

A replacement CLP may be issued if it is lost, stolen or destroyed.  The fee charged for a replacement is $10. 


SchoolBus Operators:

A school bus endorsement applicant must present a letter from his/her employer to have certain fees waived. If the letter is presented, the fees are waived for the General Knowledge test, CLP and Skills Test.  The applicant does pay the fees for the endorsements that allow the operator to carry passengers; e.g., air brakes, passenger and school bus endorsements.  A CDL with “S” and “P” endorsements is required to operate a school bus. Applicants or holders of a public passengerendorsement (S, V, A or F) must have an acceptable driving record.



Knowledge test: CDL

What you need to know before visiting an office

You must have an appointment to come into a driver licensing office. You can schedule an appointment online.

You must wear a mask indoors, regardless of vaccination status. Come prepared, wear a mask.

Many of our services are online. Try our online services instead of coming in person!

The knowledge test is available in 4 languages (interpreters aren't allowed):

  • English
  • Spanish
  • Russian
  • Serbian–Croatian

Make an appointment to take the knowledge test at a driver licensing office location that offers testing. The test fee covers 1 attempt at each knowledge test taken within 90 days of the receipt.

You must pass the knowledge test and get a Commercial Learner's Permit (CLP):

  • Before you can take the skills test.
  • Any time you upgrade your CDL by:
    • A higher commercial class
    • Adding endorsements that require a skills test:
      • Passenger endorsement
      • School bus endorsement
      • Tank vehicle endorsement (only if testing and or training in tank vehicle)
    • Removing an air brake restriction

You're required to take the knowledge test any time you:

Knowledge test scores are valid for:

  • 180 days from the date passed.
  • Another 180 days, if you renew your CLP within 30 days of your original CLP expiring. Double, triple, and hazardous materials cannot be renewed with CLP and expire 180 days from the date passed.
Knowledge testTotal questionsPassing scoreSkills test needed
CDL general knowledge (A, B, & C)5040Yes
CDL combination (A)2016Yes
Air brakes2520Yes
School bus2016Yes
Tank vehicle2016No, unless you're taking your skills test or training in a commercial tank vehicle, then you must take the knowledge test before we can issue your CLP.
Hazardous materials3024No

How to prepare

  • Study the Commercial driver guide to prepare for the test. The guide is only available in English and contains all the information you'll need to pass the test. In the first chapter you will find a table titled "What sections should you study?" This table indicates with an "x" which section(s) you should study before taking the tests.
  • You may also take the practice test for a sample of the types of questions that will be on the test.

Penalties for trying to get a CDL fraudulently could include:

  • Cancellation of your driver license.
  • Having to wait up to 1 year before you can apply again for a CDL.

Questions? Need help?

Call us: 360.902.3900 (TTY: Call 711)


Test cdl knowledge

 CDL - Commercial Driver's License

 All drivers of Commercial Motor Vehicles (CMV’s) are required to obtain a Commercial Driver License (CDL).  In order to get a CDL, you must first take and pass required knowledge and skills test. The CDL Test consists of a general test, one or more endorsement tests, and an air brakes test.  The tests that you will take depend on the license classification that you are obtaining (Class A, B, or C) and the type of vehicle that you will be driving (e.g., Tanker, Double/Triple, Passenger Bus). 

The best way to prepare for your CDL exam is with our free CDL practice tests.

The CDL Test consists of a general test, one or more endorsement tests, and an air brakes test.  The tests that you will take depend on the license classification that you are obtaining (Class A, B, or C) and the type of vehicle that you will be driving (e.g., Tanker, Double/Triple, Passenger Bus).

Endorsement Test Overview

You must pass endorsement tests depending on the type of CMV that you will be driving.  The endorsement tests are described below.
Tank endorsement – to drive a commercial tank vehicle (over 26,000 pounds) designed to transport any liquid or gaseous material within a tank that is permanently or temporarily attached to the vehicle or chassis. Does not include portable tanks having a rated capacity under 1,000 gallons.
Double and triple trailer endorsement – to pull double and triple trailers.
Passenger endorsement – to drive any vehicle, except a school bus, designed to carry 16 or more persons, including the driver.
School bus endorsement – to drive a vehicle designed to carry 16 or more persons, including the driver that is marked with or displays the words “school bus” and is used to transport students to or from school and may be used to transport students to or from authorized school activities. A school bus manufacturer, dealer or mechanic is not required to have the endorsement while operating a school bus that is not transporting students. A driver must qualify for a passenger endorsement before obtaining a school bus endorsement.
Hazardous materials endorsement – to drive any vehicle carrying hazardous materials that require placards or transporting any amount of material listed in the Federal Department of Health and Human Services regulations as a select agent or toxin.

Air Brakes Test

If you plan on driving any CMV equipped with air brakes, you must take and pass the air brakes test to remove the air brakes restriction from your CDL.  The air brakes test is different than the endorsement tests because the air brakes test works as a restriction instead of an endorsement.  If you do not pass the air brakes test, your CDL will bear a mark of restriction which means that you are not authorized to drive a CMV with air brakes.

For more information on obtaining your Commercial Driver's License, see more of our CDL articles.


CDL General Knowledge Practice Test 1【Audio Version】

Around the corner. Five minutes later Anton got out and started the car. I quickly ran home and hid behind the curtain.

Now discussing:

The way the air is pumped. "Plum" was in my ass, and the Master began to swing, after several strokes, my ass was simply torn apart, so it would burst, but the Master did not pay. Attention. Then he stopped abruptly. You should have seen yourself from the outside, you believe, now the hand will freely enter you.

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