Well it's a tested system and I guess it's looking for inconsistencies in your answers. I found answering this harder than the stage 1 tests.
I think if I'd stumbled at this point I'd have felt really let down. But like what was said before (by notlgw53 and others) - all of the testing stages are for the benefit of individuals and NATS. They aren't perfect but they probably provide NATS with a good idea of the people they want and who could get through the full training.
However, I know if I failed it I'd still try again. Just focus on being true and consistently so.