hi,

see the college you have tagged in the question i.e mgms jawharlal nehru college of engineering has no courses on diploma in engineering. however the college has lateral entry admission process in b.tech second year for candidates who wish to study b.tech after passing diploma in relevant engineering discipline. for more information follow the mention page and contact with the admission in charge,

https://www.jnec.org/direct-se-admissions.php

now if you want to take admission in diploma course you need to appear in state wise entrance test like jexpo for west bengal diploma college admission.

hope you may understand.