Hi Soumyadip,
Almost everyone is aware the certain pros and cons each candidate face due to the graduation course they pursue. This is also considered while shortlisting candidates for WAT and PI. To maintain academic diversity the rating process is different for a bachelor's degree graduate and a professional degree graduate. Now what procedure they actually follows is with respect to the IIMs. Example IIM A have different rating score for the candidates of bachelor's degree and professional degree whereas IIM Kozikode provides Academic diversity score. But keep this in mind you need to score in graduation too get your call converted in any of the IIMs.
For more information please refer these links:
https://www.iima.ac.in/web/pgp/apply/domestic/admission/selection-process
https://www.iimk.ac.in/academics/pgp/IIMKPGPAdmissionsPolicy2020.pdf
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