first: your resume has to get prepared but should be simple and specific. because the interviewers hasn't much time about this, and they had received your resume which you sent before.

second: find some informations about the company and make a value of your own perspective, that's what they think is important. they want to know your minds

third: prepare for the communication with your opponents, maybe the interviewers will get you into a group, and test your english comprehension in the group to make sure whether you could make it when you were in the real working situation in the future

forth: if you will encounter the third part, don't forget to make a conclusion of the group testing........

good luck dude^^