Hi agility,
First off, a 630/Q50 is a good score (it's a bit below the 80th percentile overall), so it might be enough to get you into your first-choice Business School (depending on the School and the strength of your OVERALL profile).
That having been said, with a V26, you're missing out on lots of points in all 3 Verbal categories (SC, RC and CR). Thankfully, the Verbal section of the GMAT is as predictable and standardized as the Quant section is, so you CAN train to score at a higher level.
Before I can offer any advice on how to improve in these areas, I'd like to know more about how you studied:
1) How long did you study?
2) How much of that study time was spent focused on Verbal materials?
3) What "steps" do you go through when dealing with a typical SC, RC and CR question?
4) What is your goal score?
5) When are you planning to apply to Business School?
GMAT assassins aren't born, they're made,
Rich