Netaji Subhas University of Technology

As per your marks, you cannot get admitted to the institutions you mentioned. But, as per previous year trends, you cannot get admitted into IIEST or BIT, Mesra.

Admission in B.Tech IT at NSIT is based on JEE Mains score, not on marks obtained in 10+2 stage.

You should maintain a minimum of 75% in class 12th.
Otherwise, you will not be eligible for DTU and NSIT.

To get admission in Netaji Subhas Institute of Technology for BE in Computer Engineering, you must have all India rank below 2.5k for a general category student in Delhi.

Deciding a college depends on various factors like stream you wish to take, and the place where you belong to. NIT-Trichy is one of the top most colleges in our country and is certainly the better option out of the three if you look in terms of academics and placements point, but as said, if you belong to North India, it would be easier for you to blend with DTU rather than NIT Trichy. I would say NIT-Trichy, then DTU, then NSIT.

You can choose any one because both the options are good for B.Tech, and I don't think any IIT is not good.

Hello Himanshu,
DTU and NSIT are the top most engineering colleges of india. So, you can go with any of them. But, considering mechanical engineeing, DTU is bit more better than NSIT.

Hello Sagar,
It's difficult to say about admission since it depends on dynamic factors. However there are softwares that will predict college in which you can get admission. I am attaching a link that will predict your probable college.
https://www.resonance.ac.in/reso/news/JEE-Main-Branch-Predictor.aspx

There is no procedure of direct admission in both the colleges. They are government colleges.
You have to clear JEE Mains with good score, then only you will be eligible for admission.