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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.
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View All Plans| 90-100 | => | 15% |
| 80-89 | => | 46% |
| 70-79 | => | 0% |
| 60-69 | => | 23% |
| <60% | => | 15% |
Missouri’s trucking sector constantly seeks professional drivers who hold a Class A CDL (Commercial Driver’s License). Tractor-trailers move soybeans, aviation parts, machinery, chemicals, and refrigerated goods all across the state and beyond. The opportunity to drive an 18-wheeler doesn’t come easy. You have to put in the time and effort to master commercial driving theory, gain behind-the-wheel experience, pass several theory and skills tests, and remember how to perform all the steps in the pre-trip inspections.
Any combination vehicle with a gross combination weight rating (GCWR) of 26,001 pounds or more, where the trailer exceeds 10,000 pounds, is classified as a Class A Commercial Vehicle. The Department of Revenue (DOR) requires all applicants to pass the official combination vehicles knowledge test and the official general knowledge exam before they can get a CLP (Commercial Learner’s Permit). A passing score of 80% or higher is required for both tests.
The official Commercial Driver License Manual (Missouri CDL Handbook 2026) will teach you the basics, helping you build a strong foundation for your dream career. Section 6 discusses combination vehicles, including topics such as air brake systems in combination vehicles, coupling and uncoupling procedures, rollover prevention, and trailer stability. We recommend reading this section several times, and when you’re ready, you can use our Missouri CDL Combination Vehicles Practice Tests to evaluate your knowledge.
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
The practice test that you’re about to take includes multiple-choice questions similar to those you will encounter on exam day. It provides instant feedback that boosts your learning potential and improves retention. A passing score on your theory exams is not enough to make you a better driver. That’s why we recommend paying attention to the detailed explanations, as they help you understand the reasoning behind the correct answers.
You must score 80% or higher to pass this practice test. Keep track of your scores and see your performance naturally improve as you progress through your learning phase. After you’ve mastered this subject, you can check out our Free Missouri CDL Permit Practice Test to strengthen your knowledge of general commercial driving theory.
Take advantage of the most efficient tools online and incorporate them into your study routine. Our practice tests are available 24/7 and can be accessed anywhere in the world. Begin your training today and take the first step toward obtaining your Class A CDL!
Driver’s Ed is - nobody wants to set foot inside the DOR. 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 2026 MO 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 DOR.
