I used the MGRE tests to practice and scored about the same as you on the Quantitative. I feel that it was relatively representative of the actual test, except I would say that the actual GRE was slightly more difficult. I ended up scoring 720 on the quantitative section which I was somewhat dissapointed with, but I think that you will be fine. The vocab section was almost exactly the same.
I am new to these boards and through lurking I have already had many questions answered, but it seems that their is a dearth in topics about the relevance of community college in the overall application. My community college gpa was low (2.7 or so). How much will this be weighed in relation to my university grades (3.5 overall and >3.8 over the last 2 years). Could this end up hindering my application?