Hi attrirahul456,
As a general rule, Business Schools tend to consider the highest GMAT Score available for each Applicant. Schools also generally do not care if you take the GMAT more than once (so having more than one Score 'on file' at a particular School is not necessarily a 'bad' thing). If you really want to know how any particular Schools/Programs handles these issues, then you should contact them directly and ask. Many applicants prefer the opportunity to have just one Score on file though - which is why those same people choose to cancel Score results before they are made available.
Have you taken the Official GMAT yet (and if so, then how did you score?)? Are you concerned about the idea of having to take the GMAT more than once - and how you might handle your applications?
GMAT assassins aren't born, they're made,
Rich