For the group assessment the day is split into 2 parts - the first is the presentation on your store walk. I would recommend not being afraid to clarify with them the subject of your presentation. Mine was on stock but looking back I don't think I was talking about the right thing at all. And make sure to watch your time too, because that's what they're really testing for! The second part is deciding on a candidate to hire. You get a chance to read through the details and then you give a 1 minute presentation on who you would choose. Then you work as a group and decide together who you would choose. The interviewers will then as you questions about your candidate, but don't be afraid to stand up for your decision.