When DMM was at seminary, I remember her mentioning reading. And reading. And reading some more. While I knew she was reading many books (usually simultaneously), now I think there's really nothing to prepare you for the number of books you'll consume as you're in Seminary.
The thing I've learned is that in grad school, 80 or 90% of the books you'll read, you'll want to read. It's a nice change from the reading hoop-jumping for the sake of the hoop-jumping that occurs in undergrad.
Anyway, I need to go finish another 100 or so pages in my "The Heart of Evangelism" text book (Very good book) and then read the gospel of John for a few hours.