CDL Commercial Drivers License General Knowledge Study Guide & Practice Test (2026)
1548+ adaptive flashcards across 16 topics. Pass your exam in as little as 30 minutes per day.
1548+ questions · 16 topics · Pass Plan · Works on phone, tablet & desktop
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Official Exam Format
What to Expect on the CDL Commercial Drivers License General Knowledge
50
Questions
60m
Time Allowed
80%
To Pass
CDL Commercial Drivers License General Knowledge Domains & Weights
CDL Commercial Drivers License General Knowledge Flashcards by Topic
1548+ practice questions across 16 topics.
Exam format, topics, registration, and how to pass.
Free Sample
20 Quick CDL Commercial Drivers License General Knowledge Questions
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Everything you need to pass the CDL Commercial Drivers License General Knowledge. No account required to start.
How Prepdex Compares
Most students either study alone with no structure or pay for tools that are just question banks. Prepdex is the complete system.
| On Your Own | Other Exam Prep | Pass Plan | |
|---|---|---|---|
| Tells you what to study each day | ✗ | ✗ | ✓ |
| Spaced repetition built in | ✗ | ✗ | ✓ |
| Finds and focuses on your weak areas | ✗ | ~ | ✓ |
| Practice tests that match the real exam | ✗ | ✓ | ✓ |
| Flashcards, guides & tests in one place | ✗ | ✗ | ✓ |
| Shows when you're ready to pass | ✗ | ✗ | ✓ |
Frequently Asked Questions
What is the passing score for the CDL Commercial Drivers License General Knowledge?
The passing score for the CDL Commercial Drivers License General Knowledge is 80%. The exam has 50 questions and you have 60 minutes to complete it.
How many questions are on the CDL Commercial Drivers License General Knowledge?
The CDL Commercial Drivers License General Knowledge has 50 questions and a time limit of 60 minutes — about 72 seconds per question. Questions are drawn from 4 topic domains.
How long is the CDL Commercial Drivers License General Knowledge?
The CDL Commercial Drivers License General Knowledge is 60 minutes long (1 hour). It consists of 50 questions requiring a 80% score to pass.
What topics are on the CDL Commercial Drivers License General Knowledge?
The CDL Commercial Drivers License General Knowledge tests 4 domains: General Knowledge (40%), Air Brakes (20%), Combination Vehicles (20%), Pre-Trip Inspection (20%). Your pass plan covers all of them with spaced repetition scheduling so you review each topic at the optimal time.
How many times can I retake the CDL Commercial Drivers License General Knowledge?
Retake policies vary by state and licensing board. Check with your licensing authority for current wait times and fees between attempts. Most students who follow a structured study plan pass on their first attempt.
How long is the Pass Plan?
Pass Plan for the CDL Commercial Drivers License General Knowledge. Short daily sessions (15-30 minutes) with spaced repetition are more effective than long cram sessions. Your plan structures each session with timed blocks and breaks.
What's free and what's paid?
The free readiness check gives you practice questions, a domain-by-domain score breakdown, and a personalized study plan — no account required. All 16 topic decks are free for this exam.
What is the Exam Pass Guarantee?
Follow your study plan, master 80%+ of topics, score 75%+ on practice tests, and study consistently. If you don't pass your official exam, we refund your purchase. Full terms here.
Is the practice test really free?
Yes. Take a free 20-question practice test to see where you stand. We'll show your score by topic and recommend the right plan based on your results.
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