Iowa DOT CDL General Knowledge Practice Tests

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

453 practice questions: Iowa law plus the rules that apply in every state.

Questions50
Correct to pass40
Passing score80%
Minimum age18 years

Iowa CDL practice tests

Test 1
Test 2
Test 3
Test 4
Test 5

Iowa 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: 50 questions and a pass mark of 40, like the Iowa CDL test.

About the Iowa CDL test

General knowledge test for any CDL class is 50 questions with 10 allowed misses. Endorsement and specialty tests are separate: combination 20 questions, air brakes 25, passenger 20, school bus 20, doubles and triples 20, hazardous materials 30, tank 20.