I would suggest reading Turbine Pilot Flight Manual (or whatever it's called), also really brush up on weather-they love to ask that stuff in interviews (make sure you can read metars/TAFs/notams), other than that basic IFR questions on the interviews, try to find a buddy that's been in the airline world and practice reading approach plates to him/go over SIDs and STARs...that's really it for most of the interviews. Also it might be a good time to reflect on past experiences you've had since you started flying...the good, bad, ugly, and emergency situations you've had. Write them down. They will ask. Good luck. Don't beat yourself up too much the interviews aren't too difficult