NIT

Hello Siddhehwar,
There are particular cut off marks based on your caste which decides the minimum marks required to clear the exam. It varies every year.
But generally to get admission into a top NIT, your score should be at least above 200. You would get admission on the basis of category ranks and hence, such a score is essential.

Hello Bhavya,
Yes, they are but it depends more on your efforts. The NCERT books are helpful in giving you a clear knowledge of the concepts and the basics, but it is necessary to have some other good books with which you can practice a lot of problems. Only if you practice more, you can perform better.
All the best.

Opening and closing rank of college is based and varies a lot from college to college and also on engineering stream. Please specify the colleges and stream for better assistance.

Let me clear few things. To get admission in IIT, one must clear JEE Mains as well as JEE Advance with good ranking.
For NITs admission, you need not appear for JEE Advance. A good rank in Mains is enough.
Next comes OBC category. Unlike SC/ST or OBC, there are two categories further. Creamy layer and non-creamy layer. If your family income is up to Rs.5 lakhs, you are non-creamy layer. But, if it is above that, you will be treated as creamy layer and you will be treated as general category student.
And, you don't need to score a 90% marks in your class 12th boards. In fact, 70% marks is the eligibility criteria for JEE Mains.

According to ranking, it's Warangal, Suratkal and Allahabad.

There are few good universities that accept JEE Mains scores like Thapar University, Punjab Engineering College, Delhi Technological University and NSIT.

Hello Gautam,
BITS-Pilani, KIIT College, VIT University, PES University, Thapar University, Sastra University, Anna University, DTU Delhi, NSIT-Delhi, PGS College, BIT-Mesra and HBTU-Kanpur are best colleges apart from IIT and NIT.

Firstly, you have to score more than 75% marks in class 12th or be in top 20 percentile of your board for being eligible for admission and then you have to score more than 150 marks to get admission into NIT, Warangal.

Based on the marks of class 12th, you are not eligible for admission in NITs.