Hi rohan89,
You haven't provided much information in this post, so it's tough to offer any advice. If you can answer a few questions though, then I'll be happy to advise:
1) What were the Quant and Verbal Scaled Scores on your Official GMAT?
2) How long did you study for the GMAT?
3) What resources did you use?
4) What were your scores on your practice CATs (including the Quant and Verbal Scaled Scores)?
5) When you say that you had 'time management' problems, what does that mean SPECIFICALLY (Did you finish any sections early? Did you have to rush just to finish a section and guess on a bunch of questions? Did you leave any questions unanswered?)
5) When are you planning to apply to Business School?
6) Have you thought about which Schools you want to apply to?
Thankfully, the GMAT is a predictable, standardized Test, so you CAN train to score at a higher level.
GMAT assassins aren't born, they're made,
Rich