Yes, Candidates can reschedule their test dates within the testing year. The reschedule should be done at least four days before the scheduled exam. Inform GRE Services by phone or mail regarding the change along with your Name, Date of birth, Address, Registration Number, test date, Preferred test centre, New Test date Requests sent by mail need to reach GRE Services at least four days prior to the scheduled GRE 2017 test date.