Websites such as DMV and Driving Tests offer free practice tests for the permit and driver's license. DMV only offers a sample test for free, but Driving Tests has multiple full tests available.
The permit practice tests offered on the Driving Tests website are based on the DMV manual, and there is no waiting to get the test results back. The permit practice tests can also be accessed multiple times for repeat practice. The driver's license sample practice test available through DMV is only seven questions long, but users can upgrade to a full test for a small fee. Through DMV, a 50-question driver's license practice test costs $9.99, as of April 2015.