I just successfully got offered a job at Myer after I had my group interview last week.
Some tips: they'll ask you to do a group thingo with some people on your table, usually from the store you applied for... I couldnt think of anything to suggest so I mainly agreed, "That's a good idea", and then I asked the group to give a summary of the points we had down and then I presented.
They may ask you to do a shop simulation, just dont freak out and be calm.
anyway, most of the people on the table will get the job, so just be nice, people can tell when you're being a c*nt/manipulative.
and sit next to the interviewer/supervisor if possible. good back posture as well
xxx