Do i have to go back truck driving school if use my cdl for a year?

It depends on the jurisdiction you are referring to. In general, once you have obtained a CDL and used it for a certain period of time (usually 1-3 years), you will need to renew it by passing a written test and/or a skills test. The specific requirements will vary by jurisdiction.

- In the United States, most states require CDL holders to renew their licenses every 4-6 years.

- To renew their license, drivers will typically need to take a written test with a passing score.

Some states also require drivers to take a skills test and provide a medical certification from a doctor.