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Based on official District of Columbia exam questions

DC CDL General Knowledge Marathon

  • Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements

Ready for something a little different? This District of Columbia CDL General Knowledge Marathon is a super-challenging practice test that contains all 693 questions from our database for this DC endorsement. If you give an incorrect answer, we’ll remember that question and will display it to you again at the very end of the Marathon 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”. Delivers some serious studying power! Do your best to complete this mega test!

120 min to complete
Available in EN and ES
DC commercial driver's license
Real exam-style pitfalls you’ll practice:
Common Traps
Distractors
Trick Wording
Double Negatives
This test is a Premium member exclusive. You'll get

All 650 exam-like questions specific to District of Columbia

Interactive learning with AI personal tutor

Unique 360° Virtual Road Simulations

Get your money back if you don’t pass

Verified for accuracy: October 2025

Reviewed by Steven Litvintchouk, M.S.
Chief Educational Researcher (ACES member)
Methodology & Editorial Policy

What to expect on the actual DC exam

50

questions

40

correct answers to pass

80%

passing score

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