Hi padmaa,
While using the OG12 during your studies would probably be fine, the GMAT has gone through some noteworthy changes since that book was published, so I'm curious about why you're asking about a specific subset of materials from a book that's approximately 10 years old. Is there a particular reason why you're asking about that specific set of RC prompts?
Before I can offer you any additional advice for your studies, 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? How many hours do you typically study each week?
2) What study materials have you used so far?
3) On what 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 take the GMAT?
6) 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