NIT Trichy - National Institute of Technology

Can you be specific about which NIT.

There have been cases where a genius makes it through with going for coaching but I would say it is mandatory for a normal student.
A coaching class is trained to study the exam characteristics and have professional who can take you through the process is a well guided way. They also provide you with materials and experts to approach and since everyone avails it now. I believe it is a necessity. It is a decent investment for a bright future.

For fresher minimum package is the lowest it is around 5.75 and there are fresher people who got 8lpa

For NITs, you need to score 75-80 at least

A score of around 200 and board score of 90% minimum

To get admission to CSE in NIT Trichy you need a rank below 2500. Placement records are very good here

I am not sure of the normalisation for ISC boards. But it is possible for you to get CSE in NIT Srinagar or Nagpur.

It also depends on your JEE mains score

I think it is around 9 lpa

You have very good chances