i had booked my gre exam dte at jun 23rd,bt again d ets releses d dts on july also,so s d tme sficient fr my original test dte r can ichange

hi actually my prob s dat i had booked my gre exam date slot at june 23rd,bt whn i m booked dat tre s no slots avble at july bt d ets nw releases d dates in july also,nd i want 2 attend fr gre coaching from 15th of dis mnth,so is d tme sufficient fr good preparation r can i change d test date 2 july