The Official Guides (OGs) have been universally acknowledged as the best source for GMAT practice questions and we recommend that you practice from both the OG 13 as well as 12. In this regard a common grouse of the students is that a lot of the questions are repeated across these two OGs and that they end up doing a lot of these questions twice. This document provides you with the details of questions that are unique to each of these OGs so that you don’t end up repeating any of the questions.
OG12 & 13 Unique Questions List (20482)