The ASE Medium/Heavy Truck Test Series includes eight certification exams: Gasoline Engines, Diesel Engines, Drive Train, Brakes, Suspension and Steering, Electrical/ Electronic Systems, Heating, Ventilation, and Air Conditioning (HVAC), and Preventive Maintenance Inspection (PMI). Successfully passing all 8 exams will certify you as a master in medium to heavy trucks. The Medium/Heavy Truck test series is available in either Paper/Pencil or Computer-Based Testing format.