A driver's license or learner's permit is compulsory for anybody operating a motor vehicle on Iowa's public streets and roads. Before receiving a driver's license or learner's permit in Iowa, you must pass a vision screening. The written test of the IA DMV exam contains the contents of the Iowa Driver's Manual, including highway signs, road rules, and safe driving techniques. There are 35 questions on the Iowa DMV knowledge test, and you must get at least 28 accurate answers to pass (80%). Practice with our Iowa drivers permit test to prepare for the official IA driver's license test.