Hi sinhap07,
From this post, it sounds as though you recently scored lower on the GMAT than you expected to. The GMAT is still the same consistent, predictable Exam that it's always been, so you CAN train to score at a higher level. If you'd like to provide a bit more information about how you studied, and your score results, then I'll be glad to offer you the advice that you need to score higher.
1) How long have you studied?
2) What materials have you used?
3) How have you scored on each of your practice CATs (including the Quant and Verbal Scaled Scores)?
4) How have you scored on each of your Official GMATs (including the Quant and Verbal Scaled Scores)?
GMAT assassins aren't born, they're made,
Rich