When the GRE has been taken multiple times, the highest score achieved on each section is used in evaluating your application.
When completing your application, you will be asked to enter a complete set of scores from only one exam date, and to scan and upload a copy of the score report. However, you will also be able to scan and upload the results of any other exam date, so that all scores will be available to the admissions committee. Additionally, the official ETS score report will reflect scores from all the test dates you have elected to report to GSAS.