Hi altairahmad,
Based on your question, I assume that you have already worked through lots of Official RC passages already. If that's the case - and you're still having some trouble performing at a high level on your RCs - then you have to be careful about assuming that working through lots of additional RC prompts will automatically lead to improvement (especially if you're going to work through newer prompts in the same ways that you worked through past prompts). If there are issues with HOW you work through RC passages (re: how 'actively' you read, your note-taking, your understanding of the types of questions that are asked and the work that you have to do to answer them, etc.), then you need to work more on developing your RC skills than simply continuing to work through additional RC passages in the hope that additional repetitions will lead to improvement.
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