are you talking about vocational institutes?
they are no good, besides they first hand you over, some pieces of metal for shaping and casting, some lathe machine basic trainings and then, finally only let you know the theory of internal combustion engine. and that internal combustion theory is only told by keeping a model engine on sight, without letting you touch anything.
in environment like today, one have to know the variants of servicing and repairing all sorts of engines out there. and trust me they are not so many engine differences, as Xulfiqar explained above. few things differ as per weight to power ratio maintenance, just to produce optimum performance.
the biggest clue is, the engine block design and function within that block remains as same as all engines, where combustion takes place, the head unit, is the part where engineers mold and fold the techniques of smart intake outtake. then there comes a choice of material strengths and designs of all engine parts, head, pistons, crank and all tiny bits from tappet to crankcase.
so piece of cake really, which is falsely told difficult, so people could not enter in this industry. specially, with flashy unexplained words, like VVTi, VTEC, where as they are only an addition of rocker arm on the cam shaft, which locks on told RPM. nasty trick of advertising but nothing more than that.
so to be honest, So called institutes over here will always discourage, by saying "NO NO, these things are not being taught here, because we don't know".
to be honest, never trust the course materials, because, you know, as the author finishes his book, a new engine technology gets introduced in market. so you can teach better in these institutes rather studying there.