Until your official scores are valid, which is 5 years from the date of exam, you can send your scores to any school at any time before or after you apply. In other words, you can send your gmat score to ISB now and apply anytime in the next 5 years. If the school don’t find your score, they will anyway ask you to resend it. It is not difficult to resend it, even if you have to.
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