Hi peterputer,
To start, are you referring to the At-home GMAT you took back in February or to a more recent attempt? If it is a more recent attempt, then did you take the At-home GMAT again or did you take your GMAT at a Test Center? Since your first Official Score included a V28, you would have lost significant points in all 3 major Verbal categories (RC, SC and CR), so depending on your Score Goal, you might need to work on your Verbal skills in all 3 areas (and you have the potential to pick up some significant points in all 3).
Before I can offer you the specific advice that you’re looking for, it would help if you could provide a bit more information on how you've been studying and your goals:
Studies:
1) How long have you studied in total? How many hours do you typically study each week?
2) What study materials have you used so far?
3) On what dates (or approximate dates) did you take EACH of your CATs/mocks and how did you score on EACH (including the Quant and Verbal Scaled Scores for EACH)?
Goals:
4) What is your overall goal score?
5) When are you planning to apply to Business School and what Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich