Marandinho,
Be sure to have a good knowledge of the Airline industry and what a pilot actually does. You'll definitely be asked.
Also I wouldn't be too worried about pass rates. At my interview day there were 7, 3 got to the final interview and I think everyone else was asked back in 6 months who didn't make it. I would try not to get stressed out about possibilities of success beforehand and just be yourself, do your prep and do your best.
Best of luck!