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Written by Andrei Zakhareuski. With over 16 years of expertise, Andrei leads Driving-Tests.org, a top online resource for driver education. His leadership has established vital partnerships with over 2,600 libraries, educational bodies, and state agencies.
 The written tests for your Commercial Driver’s License (CDL) are a critical step towards your certification. These tests not only assess your knowledge of the road rules but also ensure you understand the responsibilities and challenges of commercial driving.

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Understanding the Written Exam

The written portion of the CDL exam encompasses various topics, from general trucking knowledge to specific regulations for different vehicle types and cargo. Here’s what you need to know to be fully prepared.
The General Knowledge test is mandatory for all CDL applicants. It covers topics such as vehicle operation, traffic laws, and safe driving techniques.
For those seeking a Class A CDL, the Combination Vehicles test is required and assesses knowledge on driving combination vehicles safely.
If your vehicle has air brakes, including air over hydraulic brakes, you must take the Air Brakes test, which is about the proper use and maintenance of air brakes.
Additional endorsements, like hazardous materials (HazMat), passengers, tank vehicles, double/triple trailers, or school bus endorsement, require passing specific written tests.

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Explore the Different Categories

Here are the different test categories to know about.

General Knowledge

Covering a broad range of topics, this test is the foundational step for all CDL applicants.

Air Brakes

Specialized knowledge for vehicles equipped with air brakes is tested here.

Combination

This test focuses on driving safety for combination vehicles.

HazMat

Handling hazardous materials safely is the core of this exam.

Tanker

Learn the essentials of operating tanker vehicles.

Doubles/Triples

Master the art of handling multiple trailers with this test.

Passenger

This test ensures you can safely transport passengers.

School Bus

Special regulations for school bus operations are covered here.

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Preparing for Your Written Tests

A solid preparation strategy is essential to ensure you pass your written tests with flying colors.
Your first stop should be the state-specific CDL handbook, which provides all the information you’ll be tested on.
Regularly taking practice tests can significantly improve your familiarity with the test format and types of questions you’ll encounter.
Consider investing in CDL Premium for a comprehensive exam prep, including practice tests, ELDT theory certification, and a pass guarantee.
Knowing how the test is scored can help you focus on areas where accuracy is critical and understand how to allocate your study time effectively.

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Tips For The Important Day

When the test day arrives, keep these tips in mind to ensure you’re set up for success.
A quick review of the main points and tricky areas can help refresh your memory and boost your confidence before the test.
Ensure you’re well-rested before the exam. A clear and alert mind is your best tool for recalling information and making good decisions.
Plan to arrive at the testing center early to avoid any last-minute stress and give yourself time to settle in.
During the test, stay calm, read each question carefully, and manage your time wisely. If you’re unsure about a question, it’s often best to skip it and return to it after answering the others.
By thoroughly preparing and utilizing the resources available, you’ll be in a strong position to pass your CDL written tests and move one step closer to your goal of becoming a professional commercial driver.

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