Hi shobhi,

No it will not affect your marks in interview.

Studying from Indira Gandhi national open university has never anything related to upsc.

Even the eligiblty criteria for UPSC candidates is they must have passed or in their bachlor or masters degree. It means they must hold a degree to be eligible for UPSC exam.

Interview never looks for the college only your knowledge of the question they ask matters.

Hope this helps you !!!

Thank you and very good luck:)))