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anitharoy
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AmrithS
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BM
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gmatpapa
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No. I dont think there is overlap between OG 12 and OG supplements. There may be some overlap between the supplements and the practice section in GMAT prep.

However, make sure you purchase the second edition of the supplements.
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abmyers
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I have used both and can confirm no overlapping Qs
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M23A
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Practice official GMAT questions is highly recommended regardless of the level of difficulty. You should get all three OG books. :)

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