Hey Rishav

This time percentile will be the criteria for ranking ( relative score).

And it will depend upon total number of students and number of students score more than you.

Marks will depend upon the different shift and slots and their difficulty level.

And it can not be said that what will be the highest percentile of PWD student.( It will depend upon the students and April exam candidates).

If person who score 300 in one slot and secure100 percentile ( highest marks in the slot than all other students) and he is in PWD category  ; he got 1st rank (PWD).

But if a person score 320 marks in other slot but secure 98 percentile because 2 percent students in his slot score more than 320 .

So you have to wait till April exam results.

Good luck