I recently took the GMAT, although my aim is going to law school next year. (Already took the LSAT this year, finished apps a while back) I wanted the option of doing a JD/MBA program mainly. I scored well and it looks like that JD/MBA should be an option for me.
What did I do? Well all of that LSAT practice helped me dominate the verbal section. Logical reasoning and reading comp was no match for me

I have strong writing skills (don't use the forums as an example

) so sentence correction was also easy. I got a couple tricky questions as it tries to make things more difficult for test takers.
I wouldn't hesitate to actually pick up some LSAT practice stuff for reading comp and logical reasoning. Manhattan gmat prep books were ok, I got a few of those.
Good luck