Hi

To be eligible for IITs one needs at least  75% marks in  class 12 if belong to general or obc category or at least  65% marks if belongs to SC/ST or  must be in the top 20 percentile in  class 12 examination.

5 Subjects to be considered for calculating percentage or top 20 percentile  are :-

• Physics
• Chemistry
• Mathematics
• A language
• Any subject other than listed above

So , so yes you can count EVS marks for calculating your percentage or top 20 percentile criteria provided  you have also taken physics ,chemistry, math and one language marks in account

Thank you