Hello Subham,
Since NIRF rankings are present for both the universities -
IEM Kolkata - NIRF - 101st - https://www.careers360.com/colleges/institute-of-engineering-and-management-kolkata#ranking
University of Calcutta - NIRF - 12th - https://www.careers360.com/university/university-of-calcutta-kolkata#ranking
It shows that University of Calcutta is better and I would recommend in getting admission in same.
Hope this information helps .
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