IIIT

Options depends upon you category and homestate, so complete your question. 

You JEE MAIN rank is too good . It guarantees you good seat in good college.

For IIT seat it will vary from category.

Appear in JEE main, score good percentile and participate in JOSSA AND CSAB counseling and get admission.

It varies from college to college, but to be honest average package is just a trap . But it still will be from 7-8 LPA .

I am again repeating it varies from college to college.

No, until you are from SC, ST category.

IIIT ALLAHABAD, IIITM GWALIOR, IIIT DELHI and so on .

No , that .5 percent will make barrier in it .

What are you asking .

Even if you were from General category you can get .

But as you are from SC category no one can stop you from getting a good seat in good college with good branch.

Your EWS rank of 4,663 is strong for CSE at IIIT Nagpur—within recent Round 1 closing range (3,432–4,414). You stand a very good chance of admission. Participate in JoSAA/CSAB counseling, lock IIIT Nagpur CSE under EWS quota in your preference list, and confirm your seat when allocated.

Yes,   if you are from sc/st category.

Please share your crl rank .

And I don't think in jossa you will get .you can try in CSAB .