The MotorAge F1 ASE LightVehicle Compressed Natural Gas Test Prep Study Guide with DVD is a comprehensive educational tool designed for adult learners seeking proficiency in the subject area of light vehicle maintenance and operation. Authored by Motor Age, this study guide focuses on compressed natural gas as an alternative fuel source, providing detailed information and insights for those looking to enhance their knowledge and skills in this field. With a user-friendly DVD format, this study guide offers a convenient and effective way for students to prepare for their ASE certification exams. Also have 2 sets of test so you dont have to mark in book Worked for me i passed first time