This is how I felt about the Math GRE. On the practice test, when I gave myself plenty of time to think, I was able to answer almost every question correctly. B

This is how I felt about the Math GRE. On the practice test, when I gave myself plenty of time to think, I was able to answer almost every question correctly. But on the real timed test, I scored very poorly. They gave you so little time to solve the problem there was no "thinking" involved, it was all rote algorithmic manipulation.