If your score is good in XAT, you will get the call. It is also good because the marks have a good amount of weightage in the final selection.
Most probably, you will be questioned if you have low grades in any of the examinations and all you need to do is, just satisfy the interviewers and prove to them that you are a good candidate and this would be enough to get you through.
If you have a score anywhere above 99.9 Percentile, you will get a call from XAT. You are much more than your mark sheets and XLRI values such things which are beyond scores.