Hi JackReacher,
You have to be care about confusing "quantity" of study with "quality" of study. Simply working through lots of additional practice questions - using the same methods that you used before - will probably not lead to the improvement that you're looking for. At your current scoring level, you're clearly a strong critical thinker, but you're still making certain mistakes that are costing you points. I mentioned in an earlier post that you need to define WHY you're getting questions wrong and that is still the case. The Verbal section of the GMAT is just as consistent and predictable as the Quant section is - including the types of wrong answers that appear. It's possible that you're 'falling for' certain types of wrong answers without even realizing it, so working through that type of analysis might be worthwhile.
As far as new practice materials are concerned, for additional Official materials, you could try the Verbal-only OG. The main OG swaps new questions in with every iteration, so if you go back to a slightly older version (the OG13, for example), you then would likely come across a bunch of questions that you had not seen before). You have to be careful about doing too much 'book work' though - as that's not a realistic way to practice. There are plenty of reputable practice materials online, so you should research the options. Most GMAT Companies offer some type of free materials (practice problems, Trial Accounts, videos, etc.) that you can use to 'test out' a product before you buy it. We have a variety of those resources at our website (
www.empowergmat.com). I suggest that you take advantage of all of them then choose the one that best matches your personality, timeline and budget.
If you have any additional questions, then just let me know.
GMAT assassins aren't born, they're made,
Rich