LFG,
Treat it like any other real world problem.
Answers along the lines of 'The info in a booklet I was sent says X but I notice that since December Y has been the case' should win lots of Smartie points.
As has been pointed out many times on this board, there are rarely absolute right or wrong answers to selection board scenarios and questions (just like doing ATC really). What the selectors will be looking for is logical thinking, no getting flustered and being ready to reassess your answer in the light of new information. . .The last one is very important. Don't get flustered just because you think you've given an answer and one of the Board move the goalposts with something you hadn't thought of and that makes your answer not the best solution - its not that you're wrong just that they want to see if yo'll think it through, recognise that you may not be right, and be prepared to give a different answer (but do explain why you've changed your mind!).. .And Good Luck!