do i have the chances of getting shortlisted for GD PI with 80.81 percentile in Xat? my academics are : 10th 82%, 12th 88% Grad 71%

The All India Seats in Welingkar are very less. The cutoff usually is around 95%ile. So the chances are very very less.

Yes.you do have good chances for getting shortlisted. After getting shortlisted you will have to go through several rounds like GD PI and creativity test . After which the final selection will be done. All the best