Hello Nayan Jagtap, the condition for admission in IIT's, NIT's, IIIT's and GFTI's are that
you should get at least 75 % in 12 board
or you have to be in top 20% students of your board
if you qualify any of the above criteria then you are eligible for seating in JOSAA counselling.
Top 20 percentile of any board is calculated by marks scored in five subjects which are

Maths

Chemistry

Physics

Language subject

Any subject other than physics, chemistry, Maths, language paper

Hello student yes you're eligible if you've scored more than 75 percent in class 12 as eligibility criteria says - Candidates must passed class 12 with physics chemistry and mathematics with minimum 75 percent marks aggregate from a recognized board. You've to only fulfill one criteria either score more than 75 percent or be in to 20 percentile of your respective Board.

Feel free to comment if you have any doubt
Good luck

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