NIT

For admission in NIT, candidate must appear for JEE Mains. Unless you appear for the entrance exam you won't get admission in National Institute of Technology. The eligibility criteria for entrance exam is 12th with PCM as the subjects.
Apart from IIT and NIT, most colleges in India offer lateral entry for diploma students. These colleges do reserve some seats for lateral entry students.Diploma holders are not allowed for JEE Main admissions but they are allowed for JEE Advanced. So they can write the JEE Main exam just to qualify for JEE Advanced.

Hello!
None of the NITs accept NMAT scores for their MBA programmes. http://www.nmat.org.in/test-takers/nmat-by-gmac-accepting-institutions/ Kindly visit this link to know about the B-schools accepting NMAT scores.

Hi!
You can refer https://www.shiksha.com/b-tech/articles/nits-admission-cut-offs-2016-opening-closing-ranks-part-1-blogId-12960.

Hi, Please find the link below:
https://www.shiksha.com/mba/cat-exam-cutoff.

BITS Pilani
Vellore Institute of Technology
BIT Mesra
Srm University
International Institute of Information Technology.

As you may be aware of eligibility criteria of IIT, you need to take an entrance so I would advise you to look for colleges with direct admission or colleges with their own exam or with its state's exam.
Kindly visit this link to know about Amrita School of Engineering:
https://www.shiksha.com/engineering/course/m-tech-in-computer-science-and-engineering-data-science-amrita-school-of-engineering-bengaluru-sarjapur-road-bangalore-246453.

You can obviously find some colleges for admission to M.Tech in Computer Science. But the question here is everyone looking for the best colleges. To get admission in top M.Tech college, one needs to sacrifice in some area. If you looking for colleges with the best education and placements, visit here:
https://www.shiksha.com/engineering/course/m-tech-in-computer-science-and-engineering-data-science-amrita-school-of-engineering-bengaluru-sarjapur-road-bangalore-246453

Hi Ankit,
Please find the link below:
https://www.shiksha.com/mba/cat-exam-cutoff

1. Cochin University.
2. Jadavpur University.
3. Anna University.
4. Jaypee University Noida.
5. DTU
6. Kalinga Institute of Industrial Technology.
These are the best colleges or universities for B.Tech in computer Science after IITs and NITs.