Hey Mayur,

Careers360 has ranked NERIST, NIRJULI with AAA+ rating. This implies it is a good college.
See link: https://engineering.careers360.com/colleges/north-eastern-regional-institute-of-science-and-technology-nirjuli

Admission Procedure: 
Entrance Exam - The NERIST Entrance Examination (NEE)
Exam centres - Arunachal Pradesh, Assam, Meghalaya, Manipur, Mizoram, Nagaland, Sikkim, and Tripura.
Admission Brochure - https://nerist.ac.in/sites/default/files/pdf/ACADNotice/2017/Information%20Brochure_NEE%202017.pdf