change of name in GRE as mentioned in passport

This is regarding change of name in GRE in accordance to my passport. I have mentioned my name as GRE NAME: NAGARAJ G RAJ and PASSPORT NAME: NAGARAJ G So i wanted to remove that RAJ in GRE so kindly please help me out regarding this. I tried out every possible way called to the ets also. I didn’t got a proper response at all.