Edwards angell palmer dodge

Hi Guys,
Ive recently been applying to law firms, mostly regional/national law firms but sent a couple applications to international city firms and have been invited to attend an assesment day with EAPD and I am now extremely nervous. I understand there will be group exercises and a presentation - does anyone have any idea what these will entail? If you pass the morning sessions your invited to interview in the afternoon (I imagine being on the train home at this point) but anyone any ideas what the interviews are like ?
Any help appreciated guys. Thanks !