It sounds like you need to re-think your GMAT study strategy. First, you need to do some serious self-evaluation regarding your strengths and weaknesses. Are there certain sections of the exam or subject areas which give you lots of trouble? Or were there other factors like pacing that hurt your performance?

After answering a few questions like this, you need to design a GMAT study strategy that focuses on improving your weaknesses. I recommend some of the strategies listed in the GMAT Resources Directory. Take a look at TwinnSplitter's strategy and Ursula's strategy. If you would like to see one more example of end-to-end prep, check out my [url=https://beatthegmat.blocked[/url]Beat The GMAT Blog[/url].

And as you prep, don't hesitate to ask your questions to this community. We are here to help! Good luck!