CBSE 12th

You can start from June. You need at least six months.

Hi,
If you're a general category student, then you're not eligible.

It depends up on college and faculty.

You might get an NIT but you cannot get admission in an IIIT.

Hi,
You will get an NIT, most probably the one in your home state. Can't say about the branch.

I don't think you can, but you can check with different colleges.

Search colleges according to your preferences that provide the BBA, BCA courses. Apply online. Some colleges conduct entrance exams, some don't.

Can't say about the branch, but you'll get a NIT.

With 73 marks in JEE and with 81% in boards, your rank will be around 90000, if not more than that. With this rank you won't get admission into this college in CSE, even if you have the home state quota. The ending rank for this college is around 50000 and that is for chemical branch other state. So you wont get admission here.

there are various courses which u can take related to biology. some are pharmacy, agriculture, biotechnology, forensic Science, honours etc. all are very good streams.