Not every skill you need to become a good mechanic or other vehicle-related technician is academic. Your courses will also encourage the development of other skills that you require to do well in this field, beyond those related to fixing engines or carburetors.
You will communicate with customers on a daily basis. You need the confidence and clarity to succinctly deliver your messages and convey what is wrong with the vehicle and how to fix it. In addition to being comfortable with people, you need the confidence to believe the way you want to fix something is the right choice.