Hi,
You have increased your score by 50 points. What got you to 660 from 610 ? You did good on Quant. I myself have blown my first mock and looking to get myself straightened up.

I'm in no way fit for advising you. But here are my two cents for you.
Look for fresh material. I have started going through E-gmat
SC material and its awesome. I like it. Also, you can buy
MGMAT Grammar book as an additional/optional choice, but definitely not required when you have E-gmat.
For
CR, what I heard is that Power score is truly a bible.
RC, can be mastered by only practicing. If you can get this stuff done. I think you will be on your way to 700 for sure.
Keep reading all of the boring articles from websites such as the-economist, natgeo, scientific-american etc. This will help you to tone your vocabulary too. What I did is, I have installed a Google dictionary extension on Google chrome. If I double click and select any word that's new to me, it gives you the definition.
Good luck.