Read this post for our Analysis & Review of OG 2019 and its comparison with OG 2018!

Abbreviations used
OG 13: The Official Guide for GMAT® Review, 2013
OG 2015: The Official Guide for GMAT® Review, 2015
OG 2016: The Official Guide for GMAT® Review, 2016
OG VR2: The Official Guide for GMAT Verbal Review, 2nd Edition
OG QR2: The Official Guide for GMAT Quantitative Review, 2nd Edition

1. Do you provide access to the OG questions?
   Due to copyright issues, we cannot provide OG Questions. So you will need to purchase the pertinent books separately. You can purchase them from www.mba.com.
2. Why do the links on the questions do not work?
   Please note, as mentioned in S No. 1, we DO NOT provide OG questions. Moreover, there are NO LINKS attached to these questions. Please purchase the pertinent books.
3. I haven’t purchased the Official Guide yet. Which edition should I purchase?
   You should purchase The Official Guide for GMAT® Review, 2016.
4. Do you provide OG Verbal solutions?
   We provide OG Verbal solutions for SC and CR only. This does NOT include all questions. Please read below to understand.
   SC: We provide solutions to almost all  SC official questions (OG, OG VR2 and GMAT Prep)
   CR: We provide solutions to 80% of the medium and difficult level CR official questions
   RC: We do not provide solutions to RC official questions
5. I have query regarding one of the official questions whose solution is not provided. What should I do?
   Please post your query in the pertinent internal forums. Our subject matter experts shall be happy to help you. Regarding how to post the query, please refer to this page. Please scroll down to S No. 8 and 9 on the page.
6. Do you provide OG Quant solutions?
   We do not provide solutions to Quant OG questions. If you have a query regarding any question, please post it in the internal forums. Please refer to S No. 4 (above) for more details.
7. Is there any separate e-GMAT page/blog where I can find solutions to official verbal questions?
   Other than your course dashboard, there is no other place where you can find the solutions to official verbal questions (SC and CR only).
8. When is the right time to solve the OG questions?
   As you know, we recommend that you solve OG questions at the right time after reviewing a certain set of concepts and solving the prescribed application and practice files. You may find the list of OG Questions to be attempted at the appropriate time in the course itself. Simply look for the file that has “OG Quiz/ Official questions” in its name. Furthermore, please DO NOT leave OG questions till the end.
9. What if I remember the answers to most of the OG verbal questions (SC and CR)?
   The solutions are available for some of the official verbal questions. Some of you might even remember the answers to these questions.
   Even after that, we recommend that you solve the questions on your own using the standard process and then review the solutions for the applicable questions by clicking on the provided link (if the solution is available). Remember, thorough review after solving questions is the key to mastering the process of solving questions.
10. Is there any difference between OG13 and OG 2015?
    The questions in OG13 and OG2015 are exactly the same. You can use the question numbers provided in the “OG Quiz/ Official questions” lists available from your course dashboard.
    There was a lot of discussion regarding OG 13 and OG2015 in many online communities and forums. Here is one for instance.