If a university issues a certificate to a student who passed a written examination in a state other than the university's territorial jurisdiction. For example, if a state university grants admission and conducts exams in another state, the results will be invalid under UGCC regulations.

For example, Andhra University (state university) should not conduct examinations outside of Andhra Pradesh.

If it is done in this manner, the certificate will be invalid. As a result, it is one of the reasons why IGNOU does not admit students with such certificates.

If there is a court case against the university that issued the certificate, IGNOU will not grant admission based on that certificate. As a result, IGNOU has stringent UGC admission requirements.

If you have misplaced your mark sheet, you may contact or visit the appropriate department. Then you must submit a letter to the registrar detailing your requirements. They will then send it via courier. Instead of a duplicate, you ask for the original mark sheet. 

Try to be aware and vigilant while handling your documents so that they do not get lost.