Hritik, 

Btech eligibility criteria for NIIT UNIVERSITY is

• ≥60% marks or equivalent in Class X in five subjects (Compulsory subjects - English, Mathematics, Science and Social Studies. The fifth subject can be indicative as per applicant’s choice.). The board can be CBSE/ICSE/any other board in India or an equivalent board if from a country outside India.
• ≥60% marks in Class XII in five subjects (Compulsory subjects - Physics, Chemistry, Mathematics or Biology (PCM/PCB) & English. The fifth subject can be indicative as per applicant’s choice.). The board can be any recognized board in India or an equivalent board if from a country outside India. In case of ISC board if an applicant has taken four subjects, aggregate of four subjects will be considered.
• ≥60% marks in PCM in Class XII if opting for CSE or ECE streams, ≥60% marks in PCB or PCM or PCMB in Class XII if choosing BT and ≥60% marks in PCB in Class XII, if opting for Integrated MSc CS.
• Should be appearing in the board examination in March/April 2019 or should have the necessary mark sheets if you have appeared in 2017 or 2018.
• Should have JEE Main/BITSAT/SAT/NEET/Any other State Engineering Entrance Examination’s rank/score otherwise applicant will be required to appear in the NIIT University Engineering Test (NUET).

I can promise you if you appear in Jee Mains and score aroolund 80 marks you will easily get branch of your choice and NIIT university. 

There is no official cut off for NU. 

They just see if you have given jee mains or not. 

Hope it helps.