Are you asking about GD PI round? B-School admission or selection process is basically a two step process after the entrance test, a Group Discussion or Written Ability Test and Personal Interview. IIMs and other B-schools admit not just the candidate with a high percentile, but those who are a great presenter, have sharp communication techniques, and smarter among other candidates. 

A candidate is judged and analysed on the basis of his performance at GD-PI and WAT rounds.

GD is a method of assessing students' personality in terms of both technique and art. It is a discussion in a group of people who express their views in a free manner upon a topic. 

Personal Interview is a conversation in which you are asked about your background, lifestyle, experience so you should have clear point about yourself and If you are fresher then you should be prepared to face any question related to your projects and internships and with your qualify programme.

If you are Experienced then you should have the detail in deep about the work & also about the Organization. You should have also a clear detail Why you want to do MBA and about the specialization. You should also be prepared with Current Affairs/ GK.

Good Luck!