Hi aa008,
The OG11 is a rather old version of the Official Guide - although much of what's in that book would likely still be fine to practice with. From your post, I assume that you're looking for SC practice materials, but it's not clear if that's the only area that you need to work on. 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?
2) What study materials have you used so far?
3) How have you scored on EACH of your CATs (including the Quant and Verbal Scaled Scores for EACH)?
Goals:
4) What is your goal score?
5) When are you planning to take the GMAT?
6) When are you planning to apply to Business School?
7) What Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich