If it were me, I'd practice answers to "traditional" interview questions. Be familiar with some of the super common MMI questions just in case (that way you won't be caught off guard), but realistically... prepping for MMI questions like A&M's would be a bit of a waste. I prepped extensively for my A&M interview last year, and to be honest that was mostly a waste.
The benefit of prepping "traditional" questions is that you'll have a few personal anecdotes ready to go that, theoretically, you can work into whatever questions they give you if you need to fill time. Be comfortable with ways of working through ethical dilemmas (there are a lot of very established methods - if you need help, feel free to message), because I imagine that will pop up, but other than that... at least no one else knows either?
Good luck! Try to relax - the more at ease you are, the better you'll be able to think.