The Benefit of this Forum is the depth of information from students and parents who can give you real info. When I saw your question about what to bring, I thought you meant to ask more about what the student should expect the competition to be about. A quick Google for this Forum found the following info which I hope will be helpful.
"As to preparation, DS had to write a short paper selecting one of three topics. During the competition there were small round table discussions, each round table had three scholarship competitors. The applicants discussed their papers and the other papers being presented with a panel watching and scoring their conversations. As I recall, the panel was looking for students who could bring depth to the discussion (not just a rote paper presentation, but analysis of all the papers being discussed).
15th November 2012
Best of Luck