What documents do you need to get an AB 60 license? This Class B CDL practice test includes 20 multiple choice questions based on information in the official commercial drivers license handbook. (For this purpose, federal regulations define a hazardous material as a substance that has been designated by the US Secretary of Transportation as a material whose commercial transportation may pose an unreasonable risk to health and safety or property.) You will hardly pass the test without proper preparation. Knowledge Test Class B This license is required for driving a single vehicle with a GVWR of more than 26,000 pounds, a 3-axle vehicle weighing over 6,000 pounds, a bus (except a trailer bus), with endorsement or any farm labor vehicle, with.. Read More Number of Question 50 Passing Score 40 1. The knowledge test covers the following sections of the New York CDL Manual: School Buses, Vehicle Inspection Test, Basic Control Skills Test and Road Test. Designed to help you prepare for the behind-the-wheel (driving) part of the exam, this test covers starting and stopping, merging, intersections, lane changes, and critical driving errors that will result in immediate failure of the test. - Class B (Heavy Straight Vehicles): Any single vehicle with a GVWR of at least 26,001 pounds, or any such vehicle towing another vehicle whose GVWR does not exceed 10,000 pounds. Google Translate is a free third-party service, which is not controlled by the DMV. The DMV knowledge test consists of 36 questions and you'll need 30 correct answers to pass (83%).