Typically, a CDL exam is a mixture of multiple choice and true/false questions. Most states give the exam on a computer, but some have the option of a pen and paper test for those who prefer this method. If you don't understand a particular question, it is better to pick the answer you think is most likely to be correct than to leave the question blank.

When looking for practice CDL tests, remember that there are actually several different tests a commercial driver may need to take to earn his license. For example, you will need to take a separate exam if you wish to earn an endorsement for transporting hazardous materials. Most states also require a separate test for people who wish to obtain employment driving a school bus.

The best way to prepare for your written CDL test is to take as many practice tests as possible. You can find practice test questions at the end of each section of your state's CDL manual. Some states even have online interactive practice tests that you can use to help you review the material. If you can't find a free practice test on your state DMV Web site, try checking the DMV sites in surrounding states. Since the basic rules of safe driving are the same regardless of where you live, these practice tests will still be helpful.

Schools for commercial drivers and private party Web sites specializing in sample tests for various license classes will also have CDL practice tests available. Even though you typically need to pay to use these CDL testing resources, the investment can be worth it if you are able to pass your state's written exam on the first try. The sooner you get your license, the sooner you'll be able to find employment!