Vishnu Sri sai Shankar got 15 rank with 100 percentile in JEE Mains. It means how many marks we expect ?
The criteria of percentile in JEE mains was introduced in the year 2019 by NTA
If a person gets 100 percentile it means that he is the highest scorer of the examination and no body else has scored more than him.
We cannot definitely tell about the marks of the 100 percentiler but it means that he is the highest scorer of the exam.
Hope this helps you