Hi nik98,
In a prior post (here:
https://gmatclub.com/forum/manhattan-pr ... 28809.html), you describe that your initial GMAT Score is in the 600s (possibly 600 exactly) - and that is a strong initial CAT score (the average score on the Official GMAT hovers around 550 most years). With this post though, it sounds as though you are considering the GRE - which would require some changes in your study routine and timeline.
Many GMATers spend 3 months (or more) of consistent study time before they hit their 'peak' scores, so if you're planning to limit your studies to just 2 months, then there might be a limit to how much you can improve. In addition, from what you describe, your immediate study plan is 'book heavy'; unfortunately, many Test Takers who study in that way end up getting 'stuck' at a particular score level. Even the best books are limited in what they can teach you; they also can't force you to approach questions in a certain way and their explanations are often one-sided. There's no harm in starting off your studies in that fashion (and you would be fine with either set of those
MGMAT books), but you'll likely end up needing to invest in some additional, non-book resources at some point.
Before I can offer you any additional advice for your studies, it would help if you could provide a bit more information on your timeline and your goals:
1) What were your Quant and Verbal Scaled Scores for your 600.
2) When are you planning to apply to Business School and what Schools are you planning to apply to?
3) Going forward, how many hours do you think you can consistently study each week?
GMAT assassins aren't born, they're made,
Rich