This is percentile score not percentage score .As this only tell about relative performance of candidate in particular session in which he appears for exam.Percentile method is adopted as level of paper for every session is not same.you can calculate your score using this formulaYour score = ( your percentile ×total number of candidate in your session)÷(number of candidate  in your session who score equal to irless than your raw score×100).

Also you can take rough idea about your rank using this formula=({100-your percentile score}×874469)/100.This will give you rough idea about your rank in general category .To get category rank wait till NTA declares raw score and cuttoff for category.

GOOD LUCK!