Having crossed the first and presumably the most difficult step to securing an admission successfully, do not let all your efforts go up in smoke because you are inadequately prepared for the next two stages, viz. Group Discussion and Personal Interview.
A group discussion (GD) is a simulated exercise, where you cannot suddenly put up a show, since the evaluators will see through you easily. In this page you can find tips on GD and how to handle them to ensure a positive outcome.
Amitabh Bachan could go from being a window washer to the chairman of a boardroom without being introspective, but MBA's have to be. Before we jump in with questions and self-assessments, let's get one thing upfront and on the table. Interviewers develop an impression of you in the first few minutes of the meeting, and spend the rest of the interview confirming their initial impression. Therefore, practice, practice and practice some more... Mongoose India provide all the possible tips on attending interviews for the purpose of joining an MBA program (in top B schools).
Repeated practice of GD and Case study with well selected topics will get you ready to crack any selection process henceforth.