You have an hour to review a case study and prepare answers. As I recall there are 3 questions each relating to different data about the same scenario. Scenario involved a food manufacturer wanting to buy another food manufacturer. The questions require you to make calculations about which factories they should close based on profitability, output etc. What the different options for integration/closure are. You'll need to be strict with time on each section and do quite a few calculations in the time. Make your workings clear. Not sure how you'd prepare except to make sure you have an understanding of different operational synergies available from M&A activities. My view was that a large chunk of work is PMO on post-merger integrations.