I have re-applied as I am in the Phoenix area and do not wish to relocate at this time. I also have an interview in July.
They do give a test at the end of the day, which is a lot of CCRN questions, but they claim it has ABSOLUTELY no bearing on whether you get in or not. I did not think it was a hard test, but have been a CCRN for many years. The reason I did not get in last time was grades from 20 years ago that were coming back to haunt me. They had me re-take some sciende courses and get better grades, which I have done, so we'll see if that helps me this time.
Good luck to you. Try not to stress too much. It really is a pleasant interview experience. I interviewed at one school in PA, that I would not go to because the interview was so ugly that I wanted nothing to do with them. Midwestern does not typically ask in the interview CCRN questions, more of what can you bring to the table. They are all very nice.