I can't find my ticket to tell you exactly where I sat but when i went back in June my seat was about halfway up the center orchestra, 4 seats from the aisle. And I got my ticket at like 3pm.
I saw a Wednesday matinee about a month ago and I got a ticket at about 12:15 and it was in the 4th row dead center. I think the student seats have generally been very good, the show doesn't seem to be selling that well.