Hi BoopityBoop,
They do a quick presentation before you do the actual MMI and they'll tell you how many prompts there are per question. Last time I interviewed, I think there were five prompts, but this may have changed.
Like UCpls<3 said, they give us paper and a pencil. You'll also be given a water bottle and a sheet of stickers containing your photo that you provided when you replied 'Yes' to your invitation.
Pro tip - Before you go in, just slightly peel the corner of each of your stickers so you don't have to claw at them like a wild animal when you enter each room. (speaking from experience)
Best of luck to everyone on interview day!!