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I would say that OG11 CR questions are on average about as difficult as those of OG12. As there is a large degree of overlap between OG12 and OG11 I would rather buy OG10 if you're looking for additional practice material. You can get a used version of the book at a low price on amazon. OG10 contains a larger number of questions than OG11 and OG12, and questions are on average slightly easier.
thank you for your reply!so you mean OG 10 questions are on an average easier than OG 11 or OG 12? Actually, I've already purchased the OG 11. I had bought this during my last GMAT attempt in sept 2010. So thought I"ll use it this time.