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View All Plans| 90-100 | => | 10% |
| 80-89 | => | 37% |
| 70-79 | => | 39% |
| 60-69 | => | 12% |
| <60% | => | 2% |
To obtain a School Bus endorsement, residents of Iowa with a valid Commercial Driver’s License (CDL) must meet a series of requirements. They must pass a written exam and a skills test. The written exam evaluates their knowledge of various aspects of this subject, such as safe driving practices, the unique features of school buses, and handling various weather conditions. To pass the CDL school bus written test in Iowa, students should begin studying several weeks in advance.
Additionally, aspiring school bus drivers must complete both the 12-hour STOP class and the current 3-hour training class for the year in which they are hired. They must pass a medical examination, and their general character and emotional stability will be evaluated. They must also pass several background checks, including a check of any criminal background and a check of any past child abuse.
The Iowa Department of Transportation (DOT) offers an official CDL manual (https://driving-tests.org/iowa/ia-cdl-handbook/), which contains crucial information for everyone who wants to become a school bus driver. Updated for 2025, this manual serves as the inspiration for the official written exam, which consists of 20 questions. To pass, you’ll need to score at least 80%. It’s not unusual for students to feel anxious on the day of the test, making it difficult for them to focus. After all, the School Bus endorsement covers complex topics, but there’s a smarter approach that will help you pass this exam on your first try.
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
Our free Iowa CDL school bus practice tests closely reflect the actual written exam, offering a learning environment that allows you to evaluate your knowledge of this topic. The lack of a timer gives you the freedom to move at your own pace, so you should note down the explanations provided after each question.
For your comfort and ease of use, there are several keyboard shortcuts you can try. Check them out by pressing the SHIFT + ? key combination, which will display a full list of available shortcuts. Another useful feature shows the popularity of each answer after you’ve made a choice, giving insight into how other students answered.
Pro Tip: Keep the official CDL manual open in another browser tab while you are practicing on these tests. For each question, take your time and search through the School Buses section of the manual. By actively looking for the correct answer, you’ll also develop a better understanding of the material.
Driver’s Ed is - nobody wants to set foot inside the DOT. That’s why millions of learners trust us for simple, visual, effective prep.
We are an officially recognized FMCSA Entry-Level Driver Training provider and a proud partner to over 2,500 libraries. We work with safety organizations like GHSA and the National Safety Council to help create safer roads for everyone.
Our trademarked system automatically saves questions you miss, creating personalized tests that target your weak spots until you’ve mastered the material.
Get smarter as you study. Our new AI-powered feedback provides detailed, question-level insights to help you understand the why behind each answer.
Go beyond the boring black-and-white manual. Our interactive handbook lets you read, listen with an MP3 audio version, or even chat with it to find the information you need, faster.
We build our practice questions from the current 2025 IA Driver Handbook and refine them using patterns recent test‑takers report.
Driver handbook • Knowledge‑test/permit overview • Fees & ID requirements • Office/appointment info
We mirror recurring themes (e.g., right‑of‑way traps, sign look‑alikes) and use similar distractors and wording styles.
We don’t collect or publish actual test items and we’re not affiliated with DOT.
