Hi there
I presume that you are attending OATS for you first interview in January? I found that interview the most difficult, but they werent trying to catch anyone out.
If you have done any flying before then make sure you have brushed up on your a/c type, general nav, and principles of flight type stuff etc... Also make sure your log book looks decent(ish!). Be prepared for a the obvious questions of why you want to be a pilot (they often really push this one) and do you really know what the job is about? They are looking for more than someone just being able to fly planes eg customer service, "managing" the flight, interpersonal skills, decision making, etc.....
Also be prepared for them to try and change your mind over a couple of answers that you give. So when they ask you a question think about your answer, justify it if necessary and then with consideration stick to your guns. I think the most important bit is to be open and honest. They have asked in the past "did you speed on the way here today?" (if you arrived by car) or "have you ever told a lie"...the chances are to both questions that the answer is yes - so be honest!
Hey good luck to all who are going let us know how you get on.
HAPPY NEW YEAR