[SunilNagpal]

I originally want to be a Genetic engineering and pursue green biotechnology. And I am not making this decision because others are doing the same or any compulsions but because that is how I want to live in the future. So now can you please clear my confusions @SunilNagpal sir

It's good to know that it's by choice.

So, unless you are scared of mathematics, I would strongly suggest you to go for PCMB. Keep maths as elective subject. I hope that option is still there. This will help you a lot in the long run in understanding computational and data analysis aspects of experiments. Moreover, if you are going to opt for an engineering degree, a background of maths will be a great boost.

As far as JEE or AIIMS is concerned, I don't think AIIMS has any relevant undergraduate course that would put you on a track for Research in Genetic Engineering . JEE is the exam for you as it will help you procure a seat for engineering course. Also, if you opt for Biology as a major course, appearing for NEET will also help you procure a seat in non-engineering courses (BSc) as well.

I hope that helps