What do you want to be?
You need at least 500 for master's in a state program. 600 for Phd.
If you have trouble getting that, I have real doubts on whether 700 is something worth shooting for! I don't mean to sound discouraging but improving standardized tests isn't easy.
470 is quite common among the older applicants. it is hard to study, there is a family commitment, job is harder, harder to stay focused, lack of support, etc, financial difficulties, and now GMAT.
Workbooks and focus are the answers I think. Don't neglect the GMAT as a late night activity. I have not seen a single person who would not get what he/she really wanted and were committed to. It is all about how crazy you want to be.