The Commercial drivers' license( CDL) is a must for driving any legal combination of vehicles, including vehicles under Class B and Class C. As well known, the GVWR of a trailer is not to exceed 10,000 pounds. To obtain this license, applicants/intending commercial drivers must pass a 50-question test/exam. You have to choose from the three options for each question. To pass, applicants must answer 40 questions correctly as contained in the California Commercial Driver Handbook, which covers elements such as, Safe driving, Safe CargoTransportation test, Combination Vehicles test, Pre-Trip Vehicle Inspection Test, Basic Vehicle Control Skills Test, etcPick up this book written by an expert instructor and be SURE to pass at a siiting This Test guide contains a Class A CDL test such as General knowledge Test California Hazardous Materials ( HazMat) Test California School Bus and Passenger Vehicle Test CDL Tanker Vehicles Practice Test Combination Vehicle And Double/Triple Trailer Test Frequently Asked Question (FAQ) Grab a copy Now 15/11/2019.