Help..Much Lower Actual GMAT score than expected

Hi, I took the GMAT about 2 days back and scored a 630 ( Q 48 and V 30 ). I was extremely disappointed with the score as it was lower than my scores on the Kaplan ( 650 and 640 ) and Princeton review( 660 and 690 ). In the powerprep1 tests i scored a 750 and 740 and was expecting to corss the 700 ma...