Hello, Congartulations ! You have the opportunity to be part of the Best Airline in the world !.I've been studying Airbus Systems for a long time..alhough i've never seen a manual formula to calculate the green dot speed you might find useful info here
www.smartcockpit.com On the Top Left Corner Select the Type of aircraft(In this Case A330) i hope it's useful...Enjoy you interview...i'll be there soon too