I Amal Saxena, currently pursuing my MBA in Global Business at NMIMS, Mumbai. I want to share few of my experiences with GD/PI:
GD - The key in GD is not to be heard out completely but how effectively one can make a point without creating a commotion. Normally, group discussions can start up to be a complete fish market by everyone in the group trying to express his/her viewpoint, but how to make a point in a subtle manner without creating too much of a racket is the key. I have personally been involved in quite a few discussions and have had the opportunity to be at the other end too having worked in a consulting firm, Indianpersonnel.com. If you are unsure about the topic, try to avoid talking abruptly as that can go against you. Speak to be precise and be heard without having to yell.
PI- Confidence is the key. Most recruiters are going to look for how confident you are in representing yourself. Also do your homework on certain basics like why do you want to do an MBA, your career path in 5/10 years, Strengths / Weaknesses, Why IIM / NMIMS or relevant institute, etc. Spice up your resume well enough to make it look attractive and catch the eye of the interviewer. Finally -- If you cannot impress them with brilliance, baffle them with bullshit!