Aldi interview and general interview advice

So , I applied for a job at aldi about a week ago and a few days later I got a text (yup,really, a text) from a number I didn't recognize , inviting me for an interview ). So my question is , has anybody who works there now or in the past got any tips for the interview !? What sort of questions do they ask ?
I have seven years retail experience as I have worked since the age of 16(I'm 23 now ) I worked at morrisons for three years at a cinema for one H&m for two and was also a holiday advisor over this summer . I graduated from uni with a 2:1 in human rights in 2013, so I have the experience but I have recently had interviews at debenams and pandora and was rejected from them ? So this experience clearly isn't everything they're looking for !! Any help or advice appreciated :smile: