Hello Rashika!

A college rank is decided on the basis of number of factors taken into consideration while calculating the cumulative grade point average (CGPA) for a college which further decides it's rank in overall.

Bidhannagar college in Kolkata has got accreditation of NAAC B++ with a CGPA of 2.60. The rank as such is not provided but the colleges of NAAC A++ accreditation has CGPA of around 3.60.

So, on the basis of this scale you can decide the position of this college in terms of rank.

Hope this helps! Thank you.