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 PlansThe Exam Simulator mimics the actual exam. It will stop once you reach the maximum number of allowed mistakes.
Iowa has a high demand for truck drivers and provides rewarding career opportunities to beginners who want to support the local economy. A Commercial Driver’s License (CDL) is required to drive most commercial vehicles, including buses or trucks carrying hazardous materials. You must be at least 18 to drive within Iowa and 21 to drive cross-country. Before obtaining a CDL, you must obtain a Commercial Learner’s Permit (CLP) by passing a vision screening, a general knowledge test, and other additional tests based on the type of CDL you are pursuing. A Medical Examiner’s Certificate might be required, depending on the type of vehicle you intend to drive. After holding your CLP for at least 14 days and completing Entry-Level Driver Training (ELDT) from a registered training provider, you can take the CDL skills test, which includes a pre-trip inspection, basic vehicle control, and the on-road driving test.
The official general knowledge exam consists of 50 questions based on the official Iowa commercial driver license manual (Iowa CDL Handbook 2025). Each question has multiple answer choices, but only one is correct. You must finish the exam before the timer ends and score at least 80% to pass. The most determined students increase their learning potential by using efficient resources. Our Iowa CDL General Knowledge Exam Simulator can be a game changer for those struggling with test anxiety, as it provides an insight into the official exam. This intuitive tool lets you simulate the CDL permit test on your device anywhere in the world. It is available 24/7, so you can train whenever your schedule allows.
There are two features available in our simulator: answer popularity and a voice-over function. You will not receive detailed explanations whenever you make a mistake. However, the questions you get wrong will be automatically added to your Challenge Bank, which you can visit to strengthen your knowledge and learn from your mistakes. Start today and make your dream career a reality. With our simulator, you can ace the CDL general knowledge exam and overcome the first challenge in the licensing process.
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Methodology & Editorial Policy
Last verified for accuracy: October 2025 (reviewed weekly)
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The Exam Simulator mimics the actual exam. It will stop once you reach the maximum number of allowed mistakes.
