what should be ranking in JEE advance for score of 80 Mark's

Hello there,
The "marks vs rank" changes every year since it depends on the difficulty of the paper, and the number of candidates appearing in it. Analysing the previous year data, it can be said that, for 80 marks in JEE Advanced, you will get a rank of 21000 approximately. This is for the general category.
Hope this answer helps you.
Thank you!!