Hey Sprite,
English is not my first language be I dramatically improved my Verbal performance using three resources. The Official Guide (in your case Verbal Review since you've already been through the OG), MGMAT Sent. Correction Guide, and GMATFix.com verbal flashcards. Break your study into specific topics, and for each topic do the following:
1) Go through MGMAT Guide to learn the concepts
2) Go through GMATFix.com verbal flashcards to refine these concepts. There are lots of cards and many are available for free.
3) Once you can go through the verbal flashcards pretty much without making a mistake move on to the OG Verbal Review questions for that topic (questions by topic breakdown can be found in the back of MGMAT Guide).
Most importantly review each solution thoroughly and go back over the GMATFix flashcards often to prevent memory leakage on the more difficult topic (each card has an attached lesson and how it applies to that card).
You can see a full report of what worked for me as well as what
didn't work in another post,
www.tinyurl.com/gmatpost
I hope you find some of this helpful.
