Dear Rajat,
In order to take admission in IITs you have to appear for JEE Advanced exam.
To be eligible you should have 75% marks in your boards exam and you should be in top 20 percentile for general category and 65% marks for SC/ST.
You can check the top IITs for biotechnology below
Indian Institute of Technology, Roorkee
Indian Institute of Technology, Delhi
Indian Institutes of Technology, Guwahati
Good luck!!
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