Hi seemachandran,
There are plenty of different resources that you can use to train to face SCs. To score at a high level on SCs, you need the proper mix of knowledge (grammar rules, idioms) and pattern-matching/style (using the answers to your advantage, learning to recognize the common wrong answers the GMAT writers use, etc.). You'll likely find it easiest to learn the grammar rules and basic Tactics first, then pick up the style rules and rarer knowledge later. As long as the resources that you choose to use provide you with enough of what you need, then you can choose whichever one best matches your personality.
1) How long have you been studying overall?
2) What resources have you been studying with?
3) Have have you taken any CATs yet, and how did you score (including the Quant and Verbal Scaled Scores)?
GMAT assassins aren't born, they're made,
Rich