CDL Prep

CDL Prep is your comprehensive study companion for passing the Commercial Driver's License exam on your first attempt. Master the General Knowledge test and all endorsement exams with over 500 carefully crafted questions covering every topic you'll encounter.

Prepare with confidence using two powerful study modes. Exam Mode simulates the real test experience with strict time limits—60 minutes to answer 50 randomly selected questions, or 40 minutes for 20–30 endorsement-specific questions. You'll receive your score immediately and review every incorrect answer to identify knowledge gaps. Practice Mode lets you work through questions at your own pace with instant feedback, helping you learn from mistakes before test day.

Master all eight critical topic areas: General Commercial, Air Brakes, Combinations, Hazmat, Passenger, Tanks, School Bus, and Doubles/Triples. Answer randomization ensures you truly understand concepts rather than memorizing question position patterns—the answers shift each time you practice.

Track your progress with color-coded performance metrics. Red indicates areas where you're scoring below 70%, Orange shows solid progress between 70–89%, and Green confirms mastery at 90% and above. This visual feedback helps you focus study time on your weakest areas and build confidence in your strengths.

Whether you're pursuing your first CDL or adding endorsements, CDL Prep combines realistic exam conditions, comprehensive content coverage, and intelligent progress tracking to get you test-ready. Download today and drive toward your commercial license with proven preparation.