Hello, 

Can you please recheck the name of the institution you've provided for Diploma in Elementary Education, I cannot find an institution of such name, I've provided below the link to check NCTE approved institutions offering D.El.Ed course,you can confirm-

http://www.ercncte.org/deled_west_bangal.html

There's only SUSMITA COLLEGE OF EDUCATION, private college in Nadia district.