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desiaggie1980
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Be careful, the OG 10 is very powerful - it has 1,300 questions (compared to 900 in the OG 12).

However, it overlaps with GMAT Prep and PowerPrep and that's an issue if you are planning to take those tests. It is relevant and still does the job (even if the questions are dated).

Final words of caution - don't focus too much on solving the questions but instead spend the time on concepts and strategies....
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siddhans
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I also have OG 9 and OG 11 . What about those ? I know OG 11 has almost most of the questions repeated in OG 12. Also, is there a overlap between Verbal and Quant Review 1st and 2nd Edition
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Yes, there is a 60% overlap between verbal and math OG's as far as I remember (but this is not a very common question and I may not remember correctly)

Also see this: gmat-club-guide-to-the-gmat-official-guide-12th-ed-85956.html?fl=menu
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