Hi Zaidalam,
SCs are 'technical' in nature (similar to how Geometry questions require knowledge of formulas), so you need to know the grammar/idiom rules really well (and be able to spot when they apply) to score well in this category. Thankfully, the GMAT 'tests' a specific sub-set of English grammar, so there aren't that many rules that you have to learn (and chances are good that you already know some of the rules).
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? 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)?
Goals:
4) What is your overall 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
Contact Rich at: Rich.C@empowergmat.com