I took something, might have been the GRE, as part of my graduate level application. That was about 18 years ago though. I do remember getting a study guide like Gray. I also remember doing well overall and, for some reason, REALLY well on the math portion. Unfortunately, I wasn't going into engineering or anything involving math more complex than the basic statistics needed for standard research and hypothesis testing.
Of all tyrannies, a tyranny sincerely exercised for the good of its victims may be the most oppressive. It would be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated; but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience.
-C. S. Lewis, English essayist & juvenile novelist (1898 - 1963)