The school will receive your GMAT test report that lists each time you took the test and each component of your score. Unless a school specifically stipulates that you can combine components from different test dates, I would not advise doing so.
You could call the school anonymously to confirm, but typically, I believe that schools assume you are reporting your full score from one test.
Best,
Erin
Erin Schuhmacher
Senior Consultant
mbaMission
www.mbamission.com