Hi riccardo99
First off, a 640/Q43 is a solid Score, so it could be enough to get you into your first-choice School. Depending on the Programs that you plan to apply to, you would likely find it beneficial to speak with an Admissions Expert about your overall profile and plans. Those Experts should be able to answer your Admissions questions (and tell you the type of GMAT Score that you might "need" to be considered a strong applicant) and help define the specific areas of your profile that could use some improvement. There's a Forum full of those Experts here:
https://gmatclub.com/forum/ask-admissio ... tants-124/There's certainly no harm in continuing to study though - and you have an opportunity to pick up some serious points in BOTH the Quant and Verbal sections. Before I can offer you any additional advice in that regard, it would help if you could provide a bit more information on how you've been studying and your goals:
Studies:
1) What type of study routine have you been following? How many hours did you typically study each week?
2) Have you used any other study materials besides the ones that you mentioned? What "brands" of CATs/mocks have you taken?
3) On what dates (or approximate 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 are you planning to apply to Business School? If it's sometime soon, then what specific application deadlines are you facing?
If you took your GMAT at a Test Center, then you might also choose to purchase the Enhanced Score Report. While the ESR doesn’t provide a lot of information, there are usually a few data points that we can use to define what went wrong on Test Day (and what you should work on to score higher). If you purchase the ESR, then I'll be happy to analyze it for you.
GMAT assassins aren't born, they're made,
Rich