All your missed questions are saved
automatically for extra practice.
It's a practice test that's automatically made up of all your missed questions. Once you finish this test, you’ll be able to revisit your Challenge Bank™ to practice and sharpen your skills.
View All PlansAdding difficult questions to Challenge Bank™ is an exclusive Premium feature. Unlock access to 650+ exam-like questions, a Pass Guarantee, personalized study plans, and more.
View All PlansFederal Motor Carrier Safety Administration (FMCSA) regulations require commercial drivers to perform a pre-trip inspection at the beginning of their shift. This inspection covers critical safety components, including brakes, steering, lights, tires, and emergency equipment. If you find any condition likely to affect the safe operation of your vehicle, you are required to report it immediately and have the vehicle repaired before driving. Pre-trip inspections protect both you and other road users. You should master this procedure before you begin the licensing process. More details about pre-trip inspections and other important topics of commercial driving theory can be found in the official Iowa Commercial Driver’s License Manual (Iowa CDL Handbook 2025).
The official general knowledge exam consists of 50 multiple-choice questions. You must answer all questions before the timer runs out. A minimum score of 80% is required to pass, leaving little room for error. To ace this exam on your first attempt, you should train with our Iowa CDL Class B Practice Test. This practice test is available online, 24/7. You can access it anytime, anywhere in the world. All you need is a compatible device and a stable internet connection.
Questions you get wrong will be automatically added to your personal Challenge Bank™. This section includes detailed explanations and helpful insights. Turn your mistakes into learning opportunities and visit your Challenge Bank to identify areas that need improvement. Practice with the questions you previously got wrong and learn from your mistakes. Premium users can manually add any question to their Challenge Bank.
Updated for November 2025, this practice test closely reflects the content and format of the official general knowledge exam. With each practice session, you improve your knowledge and gain the confidence to pass on your first attempt. Begin your licensing journey with a significant boost in your learning potential, and set yourself on the path to becoming a safe and responsible commercial driver in Iowa.
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Last verified for accuracy: November 2025 (reviewed weekly)
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