Hello Abhinay Ganesh,

You can get IITs or NITs with your score in Graduation. To get into IITs or NITs  minimum 60 percentage (55 percentage for reservation category candidates) in B.E/ B.Tech from a recognised College or University.

Apart from that you must have valid GATE score to get admission into IITs or NITs.

You can check M.Tech eligibility criteria in top IITs like Indian Institute of Technology, Bombay, visit below mentioned link.

https://engineering.careers360.com/articles/iit-bombay-mtech-admission

To check previous year's cut-offs of GATE, go through below mentioned link.

https://engineering.careers360.com/articles/gate-cutoff-for-nits

You can go through below mentioned link for previous year's GATE cut-offs of IITs.

https://engineering.careers360.com/articles/gate-cutoff-for-iits

You can predict Colleges you can get using below mentioned College Predictor Tool.

Hope this information was helpful to you.

Best of Luck!!