HKCC interview 商業傳意英語

I got a letter for the interview of English for business communication in Poly HKCC...

What do I need to prepare for it?
Do I need to wear suit?
I'd have to introduce myself but what will they want to know about me?
Is there any information about this subject that I must know/ get before I go for the interview? (i.e. what's so special about this subject?)
Is the whole interview carry out in english or just partly?
It's said to be an individual one but how is it?

Please help @.@
I'm like freaking out now for the interview
Thanks a lot =]