Hi A2D2,
If this recent 490 is an accurate assessment of your current ability level, then you will likely need more than just 1 month of additional study time (and some 'tips') to get to the point that you can consistently score 650+. There's no harm in taking the GMAT as scheduled/planned, but if you're going to continue to study until you hit that Score (or close to it), then you could potentially save some time, money and frustration by pushing back that Test Date.
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:
1) How long have you studied? How many hours do you typically study each week?
2) Have you used any other study materials besides the ones that you have already mentioned? What “brands” of CATs/mocks have you used?
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)?
4) When are you planning to apply to Business School and what Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich
Contact Rich at: Rich.C@empowergmat.com