thanks for your respond.
i took the test in 11th Nov. and the result was Qua. scales score 19, Ver. scaled score 13, total 310.
now i want to take it again.
i just used "McGraw Hill's GMAT 2008 Edition". it was not enough for me and i had many problem b4 the test.
actually i can't remember most of the math issues which are requiered in GMAT test. maybe it's better to start with highschool math books!???
also i'm not native english speaker and i know that i have grammer problems specialy when i want to correct a sentence.
time managing is a very big problem for me, always time is finished but questions or essays are not finished. please................please make me some advise to solve thease.