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Since you have not mentioned the course or the college which you want to know the details of , i will give you a general idea. However,i request you to please mention the college and the course in the comment section or a new question so that we can help you better
Correspondence students complete their coursework independently, and on their own schedule, in a given amount of time. Completed work is sent back to the school for grading, and any diplomas or certificates received as a result of classes are also shipped via mail.
Some of the colleges that offer correspondence courses are :
Punjab University.
National Institute of Open Schooling (NIOS)
Kurukshetra University.
Bharathidasan University.
A.P.S. ...
Acharya Nagarjuna University (ANU) Andhra Pradesh.
Guru Jambeshwar University (GJU Hisar