A.g Leventis Interview

Pls nairalanders, i was invited for an interview nxt week with A.G Leventis,pls can someone who has done the interview with them before tell me what to expect,there interview format ?

Pls anybody with usefull hints should tell me please,i don't want to blow-up this opportunity!

It was from the application we made couple of months back cous i can't remember making any recent application recently with them.