[Rusted or rounded off: why choose when you can have both?]
I just solved a couple of Christmas problems on the farm-and-ranch side of the family (implication: overtorqued, slightly bent and jammed, rusted, or messed-up-by-the-previous-owner machinery R us) with a "Universal" wrench set that Sears has now. Six pieces for $20 in your choice of metric or king's toes and barleycorns as of a few days ago -- probably still, but you couldn't winch me into the mall right now.
They've got open-end on one end, box-end on another, and the box end is complicated on the inside. They claim to be good for (at least somewhat) rounded hex fasteners, among other things: external Torx, external spline, and square.
They may be a bit thick for some automotive jobs, perhaps to make up for the thinness of the bitey bits inside the box end of each one, but the worst that can happen is they'll fall into the "oddball gadget you only need once, at which time it is priceless" end of the toolbox.
Anyway, getting back to the original poster's question, quality tools are always a good gift in my opinion. However, I suspect that someone entering a formal training program as a mechanic these days is going to be doing a surprising amount of book learnin' and tube lookin' at, especially at first. If personally owned tools are needed at the outset, the course description or a call to the instructor might give some good hints.
--Joe