Hi gmatscore70011,
To start, there are a variety of different Quant and Verbal Scaled Score 'combinations' that will earn you an Overall Score in the 600 - 650 range, so if your Score Goal is in that range, then you don't necessarily have to tailor your studies around a 'hypothetical' that leads to just one of those specific combinations. In addition, the Schools/Programs that you plan to apply to might have certain expectations/requirements in terms of how applicants need to score in the Quant and Verbal sections. For example, a Quant Scaled Score that's just the 43rd percentile would likely be seen as a 'red flag' at a number of Programs - and by basing your Study Plan around that outcome, you might inadvertently be making it more difficult to get into the Schools that interest you.
With a Score Goal in the 600 - 650 range, you do not need to correctly answer any of the questions that you think are too hard or too weird, but you do have to keep the little mistakes to a minimum on everything else. To that end, while Geometry is not one of the 'big' categories in the Quant section, you will likely see at least a couple of 'gettable' Geometry questions on Test Day (and you will need to know the Geometry formulas/patterns to pick up those points). As such, you shouldn't "skip" any categories outright, but you should spend more of your study time on the areas/concepts that are worth the most points (and less/little time on the rarer/tougher areas).
Before I can offer you any additional time 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 exact goal score?
5) 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