I have passed 3 of 4 interviews, I have attended (1 legacy carrier, 1 bizjet and 1 locost, didnt passed another legacy in my home country). Anyhow, I think, that you cannot practice the interview part. You are who you are, and you arent what you arent.
The main idea of the interview part is to get know you, and get the impression of you. You will be fired very soon, if you learn all correct answers, and in normal ops day in cockpit you just wont fit. Be normal human, with all your strongs- and weaknesses.. Get along with others, have your all special things.. and you got the advantage - honesty is a big plus in our company, for example.