Hi Sanky7,
Since you posted this in another Forum, I've pasted over my response from there:
From what you describe, it sounds like you're confusing 'percent correct' with 'score percentile' - these are different things.
1) What is your ultimate score goal? Is it 700+ (that would be the 90th+ percentile overall)?
If you've used a resource 3 full times already, it's likely that you'll need to invest in some NEW resources (and not just redo material that you've worked through many times already).
2) When are you planning to take the GMAT?
3) When are you planning to apply to Business School?
GMAT assassins aren't born, they're made,
Rich