To prevent people from cheating, state Departments of Motor Vehicles require prospective drivers to take the written test at an approved location, which is usually a DMV facility. However, students can find a number of practice tests online.
Driving tests for both learner's permits and full driving licenses allow departments to ensure that drivers know the relevant rules and have the knowledge needed to drive safely. By requiring applicants to take the test at an approved location, departments can reduce the likelihood of people getting help while taking the test. There are a number of companies that offer comparable tests online that can help students prepare for the actual written test.