Hi,
Well as far as IITs are concerned, getting a seat there for biotechnology won't be possible and even in your category, getting a seat is quite difficult. But as stated, many IISERs take admission and you might qualify for interview in some of them. But keep in mind that you will have to register for admission in them separately on their official website. Just follow the details mentioned there and register for admission.
I hope this helps.
All the best.
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