Hi rohitgmat,

SCs, just like every other question type on the GMAT, come down to patterns. You certainly need to know the various grammar rules that will show up on Test Day, but you also need to "spot" when the rules apply. To that end, grammar is essentially a big "matching game"; you have to spot the "matching words" and then eliminate the answer choices that don't match. For example, if you're dealing with a plural subject, and a pronoun shows up later in the sentence, you know that the pronoun has to be plural (you're matching the pronoun to the noun) - you'll eliminate the answers that use a singular pronoun.

When you review SCs, are you able to define WHY you're getting questions wrong? If the answer is that you really can't remember the rules, then you're going to need to drill (use flashcards, etc.) the various rules until you do have them memorized.

GMAT assassins aren't born, they're made,
Rich