The ASE School Bus Technician Test Series includes seven certification exams: Body Systems and Special Equipment (S1), Diesel Engines (S2), Drive Train (S3), Brakes (S4), Suspension and Steering (S5), Electrical/Electronic Systems (S6), and Air Conditioning Systems and Controls (S7). While several of these tests parallel existing ASE Medium/Heavy Truck tests, each one is designed to test knowledge of systems that are specific to school buses. The School Bus test series is available in Paper/Pencil test format only. The tests are offered every May and November at over 700 test centers nationwide.