Colleges in Tiruchirappalli

You're only aiming for NIT Trichy? Why not IITs or other private institutions? How can you expect results without working hard for it?
Another thing: are you okay with getting into NITT, but into chemical or metallurgy, and get a 4 Lacs job? NIT fees are going to be hiked to almost 2 Lacs per year without hostel. Is it okay with you?
If you have the passion for those subjects and don't mind the salary, then it's fine. But I get this question from juniors who ask this question based on some placement surveys, so I don't know how you are any different. Mind you, only CS EC & EE get good salaries for core jobs.
Placements are in bad shape, teachers are very bad atleast for the first 2 years and trichy's weather is extreme and will drain out all your energy if you aren't motivated enough. Students don't learn anything in comparison to the other local colleges in trichy. Think multiple times before joining this place.
Moreover, you can crack JEE Mains with good marks within one year to get into NIT trichy if you work hard in 12th standard now.