I had gone through assessment conducted by RHB for management associate program. So have a little experience..

stratetgy for conquering the game =

1) be yourself and enjoy the game. If you treat it too seriously and keep thinking about losing or others' strengths, then you are gonna lose as your nervousness tends to show up.

2) for presentation, it is a norm for presenting spontaneously or having limited time for preparation. Dont panic . Structure your points and make sure they are interesting and creative. A good presentation should have relevance, be structured and interesing.

3) for group exercise, the observer is likely looking for the following:
  1) enthusiastic participation in discussion
  2) willingness to take on a leadership role
  3) evidence of thinking problems through
  4) ability to listen to, and communicate with others
  5) flexibility and the ability to change direction at short notice and accept different views.

Good luck. Enjoy yourself there.