You are on the right track. The OG10 and GMAT Prep are known to have an overlap. If you choose those two tags together in a strict search, you will end up with the overlap list. I recommend staying away from early official guides and by early I mean anything before 2015. That’s the only sure way to make sure you don’t run into one of the GMAT prep software questions.
PS. GMAC Seems to shuffle questions around and move them from official guides to GMAT prep and vice versa. The latest book with advanced questions for example has a number of questions from early official guide additions... different topic. I am getting carried away.
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