Is JEE Main enough to get admission in BTech at IIIT Bhagalpur?

No, interview round for BSc admission at BIT Mesra is part of BITCHEM which is not required for candidates who are open to pusuing BSc at Birla Institute of Technology, Mesra. Candidates who apply through JEE Main will not be required to appear in BITCHEM.

If candidates have identical Common Rank List (CRL) in JEE (Main) - 2026 Paper-I even after applying NTA's tie-breaking measures, the following order of additional tie-breaking criteria shall be adopted for seat allocation in JAC Delhi:
1. Date of Birth (preference to the elder candidate).
2

Candidates wishing to take admission in BTech at Ramaiah Institute of Science and Management have to appear in JEE Main, JEE Advanced, CUET-UG, SAT, KCET, COMEDK. So, yes even if you have not appeared in JEE, you can produce score card of any of the above mentioned exams. 

The East Point Group of Institutions accepts many exams for the BE course. The accepted exams are JEE Main, COMEDK, and KCET. Students can appear in any of these exams to get admission at EPGI. Students need to fulfil the eligibility criteria as well.

Amrut Institute offer admission in BTech and Diploma in Engineering based on merit in last qualifying exam. So, no JEE Main is not compulsory to take admission in Amrut Institute courses.