Thanks for everyone's advice on this subject.
I have no experience ever taking a standardized test, aside from maybe whatever they make you do in elem. school. I went to an alternative highschool with no formal grading system, and to Goddard College for my undergrad (back when it was on-campus) -- which certainly didn't consider standardization, much less require it (so I've never taken the SAT). We didn't have grades or majors, either. Somehow I managed to go from that into Columbia grad, and did well, but we'll see about this time round...