Firstly its very important that you study properly and clear your 12th grade with good marks and even get good scores in your JEE exam. As you have already decided your technological field then finding a good college based on your marks becomes an easy task. NIT ( National Institute of Technology) is a very reputed place to study technology, these are some of the best NIT's as per recent rankings:-
1. Sardar Vallabhbhai National Institute of Technology Surat
2. National Institute of Technology Tiruchirappalli
3. Motilal Nehru National Institute of Technology Allahabad Prayagraj
4. Dr B R Ambedkar National Institute of Technology Jalandhar
You should check out this link for more knowledge regarding NIT rankings and their details :- https://engineering.careers360.com/colleges/list-of-top-nit-colleges-in-india
I hope this helped.
All the best.
here are the top NIT campus you can choose for joining after jee main:-
- NIT Surathkal
- NIT warangal
- NIT calicut
- NIT allahabad
You can go for any NIT campus you are interested if you have a rank below 1k. You will get an admission easily. It is difficult to get that rank due to high competition. if you give your best in your exam and get a rank near or below 2K then you can choose any NIT campus you feel suitable.
Above are some top NITs you can consider for joining.
Hope it helps!