A South Dakota driver's license or learner's permit is required for all residents who operate a motor vehicle on any South Dakota street or highway. You must be at least 14 years old and pass the vision and knowledge test to receive an instruction permit. The South Dakota written test is based on the contents of the South Dakota Driver's Manual and contains questions on safe driving practices, road rules, and road signs and signals. There are 25 questions in the SD DMV knowledge test, and passing requires a score of 80% or above (at least 20 correct answers). Prepare for the official South Dakota written test by practicing with our South Dakota drivers license test.