This PHD Comic is really brilliant. That you should not address a professor as “Yo” is not something that is ever on a formal test. It is thus the kind of thing that is missed by the student who thinks that the point of education is to study for the tests. Your future employers will more likely be impressed that you tried to learn another language and got a “C” than that you stuck to easy material or one specific area of concentration and got all “A”s.
“Study for life, not just for this test.”