my own first interview wasnt for a job test but to attend a student's seminar in france. i was asked why i would like to remain in my field it was really embarassing cos i felt very funny- seemed all the questions had a stereotyped answer(i dont know). of course all the answers came back after i left the venue.
the main mistake i made , which consequently threw me off was that i failed to find out about the company even though they had sent materials to that effect weeks before.