NIT

There is a very less chance but yes, you can try in spot round.

You can apply for NIT Trichy or BIT Mesra.

Yes, for sure you can get admission in NIT, but the only problem you can face is for a dream branch and good NIT.

It will be tough with that. Though you have excellent board percentage, I would not recommend you to go in NITs with lower marks as you'll only get that with 104 marks in JEE being from General. Though, you can go for NIT Silchar, Pondicherry, Manipur and Surat with mining and metallurgy or B.Sc. courses in them.

Yes, there are 90% students in NITs who opted for CSE and are studying it for the first time. There is no problem with that.

Please specify the entrance exam in which you secured this rank so that I may be able to populate relevant details regarding your eligibility for admission to various NITs.
Regards.

Yes , with your category rank , you have chances of getting into NIT . Though , I again invoke you to check your marks as your marks does match with the expected rank .
Moreover , you might be opting for Non technical branches such as mining , biotech , metallurgy and chemical in average NIT's . Best of luck.

Yes, you are elegible for it and you'll easily get CSE or your desired branch in it. Best of luck.

Not, likely. You may get into lower NITs such as NIT Pondicherry and NIT Manipur. Choose them if you find them worthy. Else, chances are less with decent branch.

Of course, you can get core branches in several NITs. But, surely you will get some in spot round.