Personality test/the actual application is step 1. Step 2 you meet with floor leaders/operations. Step 3 you meet with someone big, either Operations manager, General Manager, etc. Same people from step 2 were sitting with the Operations Manager. That is when the questions began. If you know how to answer the standard interview questions, aka "what would you do if you caught someone stealing", "name a time you took control of a situation without managers looking", etc., you'll do fine. Also it helps to speak their language, its not ever just about the base product, but the value you add to the sale, and in turn, the value you give to the customer. Making sure the "attachments" are there, aka cables for printers, routers for internet, broadband service, protection plans, etc. Basically just be awake and use common sense and you will prevail.
Be patient though after the fact. At least where I applied, it took a bit to get back. But be persistent, ask when you should hear back, and if you don't, call the day after when they said they'd call and inquire. If they give you another day they'll call back, do the same thing. I don't know if it was because they were busy or something, but I didn't officially start on the sales floor till 2 weeks after.