About CDLPrepKit

Our Mission

CDLPrepKit was built to give every commercial driver applicant free, high-quality practice for the CDL knowledge exams. Whether you're pursuing a Class A, Class B, or Class C license — or adding endorsements like HazMat, Tanker, or Passenger — the right score on your knowledge test is the first step, and we want to help you get there.

Our practice tests cover all major CDL knowledge areas: General Knowledge, Air Brakes, HazMat, Combination Vehicles, Doubles & Triples, Passenger Transport, School Bus, and more. Every question is written to reflect the style and subject matter of the actual FMCSA-based state CDL knowledge exams.

What We Offer

• 📝

  500+ Practice Questions

  Covering General Knowledge, Air Brakes, HazMat, Combination Vehicles, endorsements, and more — written to match real exam difficulty.

• ⚡

  Instant Scoring & Explanations

  Get immediate feedback on every answer with detailed explanations so you learn from each mistake.

• 🎯

  Topic-Focused Drills

  Zero in on your weakest areas — practice individual sections like Air Brakes or HazMat placarding independently.

• 🗺️

  State-by-State Requirements

  Look up CDL requirements, fees, and testing locations for all 50 states so you know exactly what to expect.

• 📊

  Progress Tracking

  Track your scores over time so you can see your improvement and know when you're ready for the real exam.

Why Free?

Getting a CDL can be expensive — training programs, licensing fees, and medical exams all add up. We believe the cost of exam prep shouldn't be another barrier. That's why CDLPrepKit is — and always will be — completely free to use. No sign-up required, no credit card, no hidden fees.

The site is supported by advertising, which keeps the lights on while keeping every feature free for users.

Disclaimer

CDLPrepKit is an independent study resource and is not affiliated with the FMCSA, any state DMV, or any commercial driver training school. Our practice questions are original content modeled after published CDL test specifications — they are not actual exam questions.

CDL requirements, passing scores, and fees vary by state. Always verify current requirements with your state's DMV or licensing authority before testing.