All your missed questions are saved
automatically for extra practice.
It's a practice test that's automatically made up of all your missed questions. Once you finish this test, you’ll be able to revisit your Challenge Bank™ to practice and sharpen your skills.
View All PlansAdding difficult questions to Challenge Bank™ is an exclusive Premium feature. Unlock access to 650+ exam-like questions, a Pass Guarantee, personalized study plans, and more.
View All PlansDC CDL General Knowledge Marathon
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!
Verified for accuracy: October 2025
Reviewed by Steven Litvintchouk, M.S.
Chief Educational Researcher (ACES member)
Methodology & Editorial Policy
Official sources we check
What to expect on the actual DC exam
questions
correct answers to pass
passing score
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