NIT

Hello Balaji,
Firstly, you need to score more than cutoff in JEE Mains so that you can appear for JEE Advanced. For getting in NIT, you need to score around 250+ out if possible 360.
Best wishes.

Hello Suyog,
It's very good to know your advanced planning and dreams. It's always good to have dreams as then only we work hard to achieve it. Yes, you plan is good and workable.

Yes, every NIT has home state quota which means 50% of the total seats are allotted to home state members alone, whatever their ranks may be.
The rest half seats are open to all the remaining state students.
So, if you apply for an NIT of your state, you will fall under home state category and for the rest, you fall under other state category.

Every NIT has a different cut-off for all category students.

Hello Abhishek,
I am sure by now you must have got admission in some college. Yes, there are many colleges that accept JEE Mains score. You can find complete information on the website of Shiksha.

Hello Abhilash,
Once the results of JEE Mains are announced, if you have a valid score, then you should register on the website to get admission in NIT's. Those scoring more than cutoffs can register for JEE Advanced.

Hello Abhilash,
The only way to get admission is to study well and score good marks in JEE Mains. Aim for marks in the range of 300+ and you will get admission in NIT.

Hello Aniruddhaddha,
Even though you must be in one of the NIT's by now, let me answer for benifit of others.
After declaration of results, you have to register yourself on the admission site and fill up all the required data.
Kindly refer to the link mentioned below:
http://www.stupidsid.com/engineering-admissions?id=482

250+ for the general category.

Hello Suman,
I am afraid that the score of only 90 is not good enough for admission to NIT. I would advise you to aim for much more marks in next year's exam if you do not get admission this year.
Best wishes.