Assessment Centre is quite hectic. It began around 8 and ended at 6pm for me since I was the last candidate to participate in the afternoon session. In the morning, you attend a presentation followed by numerical and situational leadership tests. Then you do a group discussion and if you pass this, you get the stay for the afternoon sessions. In the afternoon, you do a business presentation, followed by some role playing and typical questions about career goals and leadership. The role playing is difficult. You can't win it as they will always find something to challenge you. It's how you deal with these challenges that counts.