The best advice I can give regarding the final interview at flydubai (and it should help at the CTC final interview as well) is to organize your own past aviation experiences.
The interviews are based on your stories - "give us an example" or "tell us about a time" - so the better you know those stories and have thought about your past the better.
I would have several stories prepared, focusing on the details. Be able to talk about specifics rather than generalizations. Make sure you are telling the truth too, as it is really easy to spot a lie or even an embellishment. Your stories should include what you were flying, where you were flying to, what position you were in, who was pilot flying and pilot monitoring, etc.
Once you have your stories laid out, try to anticipate which stories would fit best for which competencies they display. Hit the big ones, like communication skills, teamwork, problem solving, achieving goals, etc. If you can, have at least two stories per topic you come up with. Invariably, you will use a story that better suits the next question you are asked (which is why it helps to have two).
Also, what did you learn from the experience, and what might you do differently having gone through it? Those are pretty typical follow ups in any interview (not just flydubai).
Be yourself! Having this organization of your experiences will help you be more relaxed so we can see you for who you really are (hopefully that is a good thing!).
Hope that helps,
Randy