monira,
I have the same problem. other than recommending you to take the test again and try to improve your score, I can tell you that there’s a lot to do even with a low GMAT, here is a helpful video I found: http://www.aringo.com/low_gmat.htm

Hi,
I am in similar situation (even worse...) and apparently there’s a lot to do about this, FYI see here:
http://www.aringo.com/low_gmat.htm