Everything you need to pass the Iowa knowledge test — car, motorcycle, and CDL. Free practice included.
License type
Select your license type to see test requirements and available study materials.
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About the Iowa DOT
Agency
DOT
Languages offered
21
Retake wait
Next business day
Test fee
$20
Minimum age
14
The Iowa DOT knowledge test has 35 questions. You need to answer 28 correctly (80%) to pass. The test is administered by the Iowa DOT. Questions cover traffic laws, road signs, right-of-way rules, and safe driving practices specific to Iowa. If you don't pass, you can retest after next business day.
The Iowa motorcycle permit test has 25 questions. You need to answer 20 correctly (80%) to pass. Questions cover riding techniques, road rules, gear requirements, and safe riding practices specific to Iowa.
The Iowa CDL knowledge exam covers general knowledge plus any endorsements you're pursuing — air brakes, combination vehicles, HazMat, tank vehicles, doubles/triples, passenger, and school bus. Each section is scored separately, and you must pass every section required for your license class and endorsements. Our practice tests mirror the real exam's format and difficulty, so there are no surprises on test day.
What trips people up
Based on questions Iowa drivers get wrong most often.
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