What percentile would be required by a female BA Humanities fresher student in the CAT to get into IIM BLACKI or Shillong?

It is difficult to provide a definitive answer to the question about the minimum percentile required for admission to IIM Shillong without more information about a candidate's past academic records and other relevant details. Different IIMs may have varying selection criteria and place different levels of emphasis on factors such as past academics, work experience, CAT and PIWAT scores, and undergraduate diversity. 

Additionally, the minimum qualifying CAT score required for the GD-PI round in 2022 is 75 percentile for students in the General and EWS categories, 50 percentile for students in the DA and ST categories, and 60 percentile for students in the SC category. Candidates who meet these requirements and pass the GD-PI round will be considered for admission to IIM Shillong.