Hello Nagendra

Percentile is different form of representing your marks .

It is the relative score in the test means it depend on the number of students score more than you and total number of student .

So you can not calculate your marks from the percentile marks.

It can be 300 or can be 250 on the same percentile marks.

I think you get ;what i am saying.

Any doubt related to it you can ask.

Good luck