CDL Class A Commercial Drivers License Knowledge Test Practice Test

The test is comprised of multiple individual knowledge exams. All candidates must pass the General Knowledge test. Those operating vehicles with air brakes must also pass the Air Brakes test, and those planning to drive combination vehicles must pass the Combination Vehicles test. Additional endorsements, such as Doubles/Triples, Tanker, or Hazardous Materials (HazMat), require passing their respective specialized knowledge tests. Each test is typically 20-50 questions, and a passing score is usually 80% or higher per section.

Official preparation begins with your state's Commercial Driver License Manual (CDL Manual), which is the primary source for all test questions. Study each relevant section (General Knowledge, Air Brakes, Combination, etc.) thoroughly. Supplement with reputable practice tests from official state websites or established training providers to familiarize yourself with the question format and identify knowledge gaps. Many successful candidates benefit from professional truck driving school programs, which offer structured classroom and practical training.

Upon passing the required knowledge tests, you will be issued a CDL Learner's Permit (CLP). You must hold this CLP for a minimum of 14 days (federal requirement; state rules may vary) before you are eligible to schedule the skills test, which consists of a Vehicle Inspection Test, Basic Controls Test, and Road Driving Test. During this period, you may practice driving a CMV only when accompanied by a CDL holder who has the proper class and endorsements.

Yes. You must be at least 18 years old to test for an intrastate CDL (driving within your state only) and at least 21 years old for an interstate CDL (crossing state lines). You must possess a valid non-commercial driver's license and provide proof of identity, residency, and Social Security Number. You must also pass a Department of Transportation (DOT) physical exam and obtain a Medical Examiner's Certificate before being issued a CLP or CDL.

CDL classes are defined by the vehicle's Gross Vehicle Weight Rating (GVWR) and configuration. A Class A license allows you to operate any combination of vehicles with a GCWR of 26,001+ pounds, provided the towed unit exceeds 10,000 pounds (e.g., tractor-trailers, tankers, flatbeds with large trailers). Class B covers single vehicles over 26,001 pounds or towing a unit under 10,000 pounds (e.g., straight trucks, large buses). Class C is for vehicles designed to transport 16+ passengers (including the driver) or hazardous materials in placarded amounts that do not meet Class A or B criteria.