Currys interview questions

I applied online for a second time after failing the first online test. I applied online for a store in London. It took them three days after I applied to call me for a phone interview. I was slightly unprepared as I didn't think I would actually get the job as I am under 18 but in the end I was told to come in for a face to face interview the next day. I arrived at the shop 15 minutes early in a blazer and skirt where I met the duty manager. The session was to be divided into three. The discovery session - where I met other staff and spoke to some customers for an hour. That was okay as I wasn't particularly shy around others. Then next part was the role play, in which I was given a sheet with different tablets and the manager took the role of a customer. That part was mostly common sense. Then the last part was competency interview. And for that part I interview I talked to two different managers. Altogether my experience lasted about 3 hours for some reason.