Hi
pravs, assuming that you're planning for self-study,
Powerscore CR Bible seems to be a popular resource for the
theory part. For practice, this forum offers an almost limitless bounty:).
Also, in 3 GMATPrep tests, you have scored in 20s in Verbal. With an 80% accuracy that you've claimed in SC and RC, your Verbal scores look to be uncharacteristically low. Suggest you critically look at this again.
In any case, while you focus on CR, make sure you
don't do this at the
expense of SC and RC (and even Quant for that matter).
Between two successive attempts, I have seen sectional scores of test-takers
wildly (not just mildly) fluctuating between various sections, because they have been just been fixated with preparing for just one section/sub-section.