Their interview more focus on how fluently of ur spoken english and u have to be fast thinking as they will give u a topic title with some simple word such as "Milk", "National Park","Sport"....then ask u to tell story without giving u any time to think.
They wont ask anything about ur academic background.......nor u specific technical knowledge....They will just justify your communication skill and personality!!!
I had failed my interview with Shell for internship few months ago..that's the experience and conclusion from my interview...