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Before you can begin a commercial driving career in Illinois, you must complete the licensing process and get a Commercial Driver’s License (CDL). Aspiring drivers who will be engaged in so-called “non-excepted commerce” must complete a DOT medical exam. You will also need to pass a vision test, provide identification documents, and pay the licensing fees. The official general knowledge exam will evaluate your understanding of pre-trip inspections, cargo handling, hours-of-service rules, and your responsibilities as a commercial driver. A minimum score of 80% is required to pass, leaving little room for error.
To expand your career opportunities, you should also pass the official air brakes knowledge exam. Doing so will remove the L restriction from your CDL, allowing you to operate commercial vehicles equipped with air brakes. If you are completely new to commercial driving, the official Illinois Commercial Driver’s License Study Guide (Illinois CDL Handbook 2026) will teach you the basics. You should read its contents multiple times during your learning phase.
Our Illinois CDL Class B Practice Test has 50 questions with multiple answer choices. Since only one answer is correct for each question, you should take your time and think before making a selection. Read every question twice and, if you need help, you can request a hint from our automated assistant. To reflect the latest updates brought by DMV rules and state law, we keep our practice tests up-to-date. This practice test is current for January 2026, so you will always practice with the latest version.
M.S., Chief Educational Researcher (ACES member)
Last verified for accuracy on
When you train with this practice test, your progress is automatically saved in your browser. If you come back later, you can pick up right where you left off without losing your results. Keep in mind that this works only if you are not using private browsing mode (such as incognito mode in Google Chrome). If you are in private browsing mode, your progress will be reset once you close the window.
Each study session gets you closer to your dream career. Start today and train with our Illinois CDL Class B Practice Test regularly. With repetition, you will master commercial driving theory and ace the official general knowledge exam on your first attempt.
Driver’s Ed is - nobody wants to set foot inside the DMV. 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 IL 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 DMV.
