Your Progress

  • 0 Incorrect
  • 0 Correct

How to Pass The First Time

  • Practice with the Free tests
  • Unlock 67 Premium tests
  • Review our Premium Cheat Sheets
Pass The first time, guaranteed

or we return 100% of your money

 
 
 
 
 
Advertisement
Ask DMV Genie AI
new
Explore free tests
  • Updated for December 2024
  • Based on 2024 IA commercial driver's license manual

IA CDL Air Brakes Marathon

Ready for something a little different? This Iowa CDL Air Brakes Marathon is a massive practice test that contains a mixture of all 183 questions that we have available for this IA endorsement. If you give an incorrect answer, we’ll remember that question and will display it to you again at the end of the exam until you’ve answered that question correctly. In other words, the Marathon will cycle through your missed questions until you answer each one correctly. You must make a 100% to pass. We suggest you attempt this one after you have practiced the state’s “regular” tests, but before the “Exam”. Give it your best shot!

  • Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements
This test is a Premium member exclusive. You'll get

All 650 exam-like questions specific to Iowa

Interactive learning with AI personal tutor

Unique 360° Virtual Road Simulations

Get your money back if you don’t pass

About this test

12 min to complete
Available in EN and ES
Verified by Steven Litvintchouk, M.S., Chief Educational Researcher, Member of ACES. See our detailed commitment to accuracy and quality in our practice tests.

What to expect on the actual IA DOT exam

25

questions

20

correct answers to pass

80%

passing score

Are you in another state?

Your go-to, trusted source

Experience the Driving-Tests difference
Since our foundation in 2010, Driving-Tests.org has led the way in online driver's education, with over a decade of experience. Our dedicated experts, bringing together more than 50 years of collective expertise, have established us as the largest non-governmental organization in the U.S. solely focused on driver education. We go beyond the official manuals, offering unique interactive experiences and support like audio guides and an AI Assistant, to cater to different learning styles and needs.
Helping hundreds of thousands to ace their tests, our resources have earned a 4.7-star rating from over 14,500 reviews. Our goal is to make your path to becoming a confident driver as straightforward and effective as possible.
×

Get your ELDT certificate and pass CDL exams the first time. Guaranteed.

Get full access to our 3-in-1 program, starting at $79. CDL schools charge $3,000-$4,000 for that.

  • All 1,500 IA exam-like questions

    Pass Guarantee: pass your permit exam, or get your money back

  • ELDT certification included

    Official FMCSA-approved provider, instant completion reporting

  • Industry-leading 99.06% success rate

    Compare with the average US passing rate of 49%

  • Trusted by over 1.15 Million customers

    The only program recommended by DMVs

Get CDL Premium Now

Try Driving-Tests Premium

Pass the knowledge test the first time, guaranteed.