Illinois CDL General Knowledge Practice Exam 2026

This is the full simulation of the Illinois CDL general knowledge test - the commercial drivers license test itself, not a warm-up. The 2026 CDL knowledge test format is reproduced exactly, so you find out where you stand before it counts.

The straight answer people search for: the Illinois CDL exam is 50 questions, and a passing score is 80 percent, which is 40 correct answers. That standard comes from the FMCSA and applies identically in every state, so nothing you learn here is Illinois-only trivia. It is also the commercial driver license permit test - clear it and the Commercial Learner's Permit is within reach.

Questions span vehicle inspection, basic control, shifting, space and speed management, seeing hazards, adverse conditions, cargo, accidents and fires, and driver fitness. Score below 40 and you have a study list rather than a failure. Take that list to the Illinois CDL Manual, then sit this Illinois CDL real exam simulation again until 40-plus is routine.

Keep going:

• Illinois CDL Practice Test
• Illinois CDL Practice Test 2
• Illinois CDL Practice Test 3
• Illinois CDL Practice Test 4
• Illinois Air Brakes Practice Test
• Illinois CDL Combination Practice Test
• Illinois CDL Pre-Trip Inspection Practice Test
• Illinois Hazmat Practice Test
• Illinois Class A CDL Practice Test
• Illinois CDL Practice Test

Every question traces back to the Illinois CDL Manual - skim the right-of-way and signs chapters before your retake.