Hello,

the subjects consider to calculate the top 20 percentile for different boards are :-

• physics
  
• chemistry
  
• mathematics
  
• 1 language subject
  
• any other subject other than above 4 which means any one which you have scored highest. If you have scored highest then yes EVS will be considered.
  

for more details you can check the link here and get the cutoff also:- https://engineering.careers360.com/articles/top-20-percentile-of-class-12-boards-for-nits-iiits-and-cftis

Hope it helps!