More a education game than a simulation game
In this game, you are tasked with fixing a stream of cars with various problems. At the start of each level, you receive a clipboard with a check list of objectives. Change the brake pads. Check the exhaust. You're also given a note from the customer trying to give more details about what's wrong with the car. Your job is to fix the car, stamp the form, and send your customer on their way.
There's a lot in there for the price, but there's only so much you can fix in a car, and with 75 levels in the main game, along with an "endless mode", things become repetitive fairly quickly.