To be eligible for the Diploma degree at Narayan Industrial Training Institute in Patna, candidates must have completed their 10+2 education from a recognized board. Additionally, they should have a strong interest in technical skills and a passion for learning in the field of industrial training. Candidates with a background in science or mathematics are preferred, but students from other streams may also apply. It is important for applicants to demonstrate a willingness to work hard, a commitment to their studies, and a desire to pursue a career in the industrial sector.