hey Rachna

percentile is a relative score you cannot predict your percentile right now.

And it will depend upon other students marks and difficulty level of your particular slot.

like: in a 100 marks test 10 students marks are-

20,30,40,45,50,57,65,67,70,80

than the person who score 57 marks secure 60 

case2- 100 marks test ,10 students' marks are:

22,34,43,47,50,53,55,57,70,80

now the person who score 57 secure 80 percentile.

i think you get what i am saying.

so i would suggest to study and score maximum marks as you can so that you got maximum percentile according to your marks.

so good luck