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Re: Timing of sending free GRE scores
The short answer is that some schools keep GRE scores on file for long periods of time while others require them to be resent every cycle.
When I applied, I had taken the GRE two years prior and like you sent four or so reports. Some of these 4 schools had a status page which said whether score reports were received (or when your application was linked to a report on file). If the school either:
1. Did not have a status page.
2. Did not show my report linked to my application.
I emailed them and asked if I should resend. I think 3 or so of the schools said it was fine, and 1 asked me to resend because they cleared their file every year.
I would suggest doing your application and then checking the status/GRE page. If there is no green check mark or equivalent next to your GRE score report after you enter the relevant test information, email the admissions staff.