Kristinely
How long did it take to study for the GRE's?
I took a long weekend (three days) with a Princeton review GRE book and wound up scoring a 560 verbal, 670 math and a 5 on my written section, so I wouldn't worry too much about it.
I took a practice GRE offered by some GRE studying company at my college but got less then 1000 total. I"d take pre-GRE tests with a grain of salt, especially if offered by an organization that is trying to sell you on a GRE class.
The most useful thing for me was the CD which had a GRE like program on it that came with my Princeton Review book. I took a few of those to get nice and relaxed with the computer test taking.