I'm with Banana Joe on this one, while Psychometric tests/Group Exercises/ PC quiz's etc does have a part to play in any selection process, it cannot replace good old gut feeling.
I remember several years ago I was discussing this with a very experienced Aussie Skipper, we were conducting a LPC for him, he had been turned down by one of Britain's Favourite Holiday Airlines, he had been told he failed the Group Exercise, to which he then told the HR person, that despite being a current TRE and having over 15,000 hours flying experience obviously does not count for anything. Shortly afterwards he got a very nice BBJ2 job and as far as I know is still very happy there.
So no I would not worry too much about failing the Cathay entrance exam. If anything I would try to figure out where you went wrong and work on passing the HR game next time. Good Luck