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Illinois SOS CDL General Knowledge Practice Tests

The general knowledge test every commercial driver license applicant takes. Practice with 5 tests built like the real Illinois exam, then try the full simulation.

448 practice questions: Illinois law plus the rules that apply in every state.

A straight highway through cornfields toward a distant city skyline, a typical landscape of Illinois

Minimum age: 18 years for an intrastate CLP or CDL; 21 years for interstate operation or to transport passengers

Illinois CDL practice tests

Illinois CDL exam simulator

Answer at your own pace. After each question you see the correct answer and why, and at the end a review of what you missed.

  • Random practice: 20 random questions; pass with 16 correct, the same ratio as the real test.
  • Exam simulation: 30 questions and a pass mark of 24, like the Illinois CDL test.

About the Illinois CDL test

The Illinois CDL Study Guide states that the general CDL core knowledge test consists of 30 standardized multiple-choice questions and requires a minimum score of 80 percent.