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whiplash2411
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Also see this about what OG editions are covered in the MGMAT guides
manhattan-gmat-books-3rd-4th-edition-conversion-tables-91671.html
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I'm using the MGMAT 4th editions and they refer to the 12th edition.
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So, getting the OG 10 as a supplement to the OG 12 probably seems like the best idea. Do you guys agree? (I have the Quant and Verbal Guides as well)
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I think OG 12 is sufficient. Keep in mind that OG 10 overlaps with GMAT Prep, so you shoot that down potentially and I'd rather have uncontaminated GMAT Prep score than extra practice with questions. Just my thoughts.... but to answer your question - yes.
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