Hi TargetMBA007,

While the 'format' of the GMAT changed in 2018, the overall subject matter that is tested has not. Thus, working through the GMAT2015 Official Guide should be fine (and you don't need to purchase the GMAT2020). That having been said, while the OG books are great sources for practice questions, but they're not designed to teach you Tactics, patterns or the little 'secrets' behind the GMAT - for those, you'll need Course-oriented materials. As such, you might want to work on the OG a little later on in your studies.

Before I can offer you any additional advice for your studies, it would help if you could provide a bit more information on how you've been studying and your goals:

Studies:
1) How long have you studied? How many hours do you typically study each week?
2) What study materials have you used so far?
3) On what dates did you take EACH of your CATs/mocks and how did you score on EACH (including the Quant and Verbal Scaled Scores for EACH)?

Goals:
4) What is your overall goal score?
5) When is your exact Test Date?
6) When are you planning to apply to Business School?
7) What Schools are you planning to apply to?

GMAT assassins aren't born, they're made,
Rich

Hi TargetMBAA007,

It’s been a few months since we have heard from you. Did you end up taking your GMAT?