NIT

No, if you are doing diploma in mechanical engineering you cannot apply for IIT or NIT because it has stopped taking any lateral entry admission and if you have done your 12th then you can surely apply for the JEE mains advanced.

Hello Sai Kumari,
As per your marks in JEE Mains, your chances are nil for getting any NITs, however, check here to know more.
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor

Hello Vivek,
The cut off marks vary every year for each category but it is required to have a score like 250 and above to get a top NIT for SC category. You need to have a score like 100 and above to get an NIT.

Hello,
The following are the top 10 IITs:-
1)IIT Bombay
2)IIT Delhi
3)IIT Kanpur
4)IIT Madras
5)IIT Kharagpur
6)IIT Roorkee
7)IIT Guwahati
8)IIT BHU
9)IIT Hyderabad
10)IIT Gandhinagar
The following are the top 10 NITs:
1) NIT Trichy
2) NIT Surathkal
3) NIT Warangal
4) NIT Rourkela
5) NIT Silchar
6) NIT Durgapur
7) NIT Manipur
8) NIT Hamirpur
9) NIT Meghalaya
10) NIT Kurukshetra

According to me, NIT-Patna is the best NIT for doing civil engineering as from NIT-Patna a student gets placed at a package of 70 lakhs a few years back which is the highest package to a civil engineering in its core company.

If you have confidence in yourself that you will stay away from all kind of distractions and totally focus on your studies then no one can stop you from scoring good marks in JEE and getting admission in NIT. But if you are not sure then go for computer science.

Hello Manas,
JIIT, Noida is among top private colleges of India, It secures under 60 rank in the latest MHRD ranking. So it is definately better then lower grade private colleges under UPTU domain. However, if you are not getting your preferable branches at the lower NITs then only switch to JIIT.

Hello Ranjita,
The minimum percentage in 12th board exams is 75% for general category and 65% for SC, ST and PWD candidates. You need to secure the above percentage or should be in the top 20 percentile students from your board means you should be in the top 20% of students from your WB board.

Hi,
No, according to JoSSA policies, if you are not having 75% or more than 75% then you are not eligible. Either, you have topped JEE Mains/Advanced.
Only one thing can happen in your account, if you are in the top 20 percentile of your board (less than 75%) then only you are eligible for a seat.

Yes, it's valid. In each branch, specific seats are reserved. See, JoSAA seat matrix for more specific numbers.