Indian Institute of Technology, Delhi

Sure, you can. Go for it.

Marks may depend on the year.A rank upto 5000 will be good to go.

Rank upto 5000 for getting CS.

If by free seats you mean the one that are left for spot round of counseling then that may vary from university to university and there is no spot round for IITs for others NIT you may get admission in 80,000 rank as well but you need a high rank to get into a decent NIT for that rank up to 15000 would do depending upon the trade you are interested.

For NIT you may get admission in 80,000 rank as well but you need a high rank to get into a decent NIT for that rank up to 15000 would do depending upon the trade you are interested.

Jee advanced is the way to get admission.Jee Mains and board top 20 percentile are just the prerequisites.

Yes the college offer lot of sports.Football is also one of them.They also have a training facility.They do not participate in league but they have many inter-college events.

Depends on which state from which state you are ?If state has good college which offers admission based on state rank,there is huge probability that you will get one.