It's ideal to come in on the GMAT above the school's average, but of course things are not always ideal. Each school also publishes an 80% range, so your score should at least be in this range for each school, which from your list I am guessing is around 620-720. Being Indian, however, you unfortunately have to work extra hard to stand out from the crowd--you can thank the volumninous number of your fellow countrymen for that challenge.