Besides anything that you learn in school will be outdated to some extent by the time you finish the course, so the only way to stay current is to get real world experience. I myself am 18, and built my own computer maybe three years ago.
So to sum it up, whenever you buy a computer from anybody that isn't one of the major computing cooperations (Dell, HP, etc.), your buying it on goodwill. Computer technology is evolving too fast for a classroom approach to computer servicing, and real world experience is the only way to stay current.