XIMB is a good college but if you are willing to retake the CAT, you have a good chance of getting into a tier 1 college. In the long run, a tier 1 college makes a significant difference in terms of brand name, association, peers, and a strong alumni network.
One of my friends re-took the CAT exam. He mentioned some important factors you could focus on:
It seems that you have a good profile. You haven't mentioned anything about your work experience. Assuming you are a recent graduate, It is suggested that you get a job.
However, If you believe that your performance was unsatisfactory, you still have a full year to improve.