Hello Abhishek..

With this XAT score of 15, you can expect a percentile between 74–78.
Also you can check your chances of b schools you can get in by your XAT percentile through XAT pathfinder tool. You shall be asked few parameters through which you will get your prediction.
Steps to use this tool:

Sign-in either via gmail or facebook account.
Enter your XAT 2019 actual or expected percentile, and click on the button ‘Unlock Badge’ button.
You will now be asked to enter a few details related to your educational qualification. Enter the details correctly and click ‘Submit’ button.
You can see a list of colleges along with their details and rankings in different top publications.

All the best:)