SDN feedback and went over my AMCAS. I'd advise you to know your AMCAS well and know about issues related to things peripherally related to your essays and activities. i.e. if you mention your native country and the poverty there then be able to know the political issues that may be the root of those problems and be able to discuss it.
They don't expect answers to be the world's solutions just to see that you can think quickly about the issues and that you are able to come up with an answer on the spot.