SMEAT

JEE Mains college predictor is an online tool which predicts the probable colleges based on the difficulty level of the examination, average marks scored in JEE Mains and seats available in IITs, NITs, GFTIs, and other SFTIs. The rank predicted might not be accurate but it certainly does give an idea to the aspirant. Know your college admission chances based on your JEE Mains rank, home state, caste, gender, etc., here:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor

No, it's not possible for you to get admission in any of the NITs. You can go only for private colleges, use the predictor tool to know about the colleges you are eligible for:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor

Hi Pooja,
As per previous year cutoff you might get seat.
Don't leave it apply to NIE CS as the first preference then you may get seat.

You cannot get CSE but there are chances for you to get ECE. Not sure whether you can get it in round 1.

For all the details click the mentioned link: https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor

Yes, the minimum score required for TCS, Madurai in NATA examination is 80. As you have cleared the cut-off range for this college, you can easily get admission.