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the topics seem to be the same in all the countries, and u don't have to worry about the answer because there is no right or wrong answers; for example, they don't care if u give the amount of money for homeless kids or for the red cross. You have to worry about how to share ur opinion with others without interrupting them and the way u express urself.
In the first group discussion, u will have to introduce the person on ur right hand side, and the recruiters will ask u to ask that person questions like: what is the thing he didn't mention in his cv, what was his biggest achievement, the most embarassing moment, where he would like to travel, if he had the opportunity to be invisible what would he do... Here they want to see how you cooperate with a colleague, do u easily get along with them. When its ur turn to speak, stand up with a big smile, look at your colleagues and say; my colleague's name is xxx, he comes from... and then u answer what they told u. Be confident here and relaxed and smile and look at ur friends not the recruiters until they say thank u, u look at them and u smile.
Then they will give u a topic to discuss as a GROUP!! answers doesn't really matter. You should work as a team, u should all give ur opinion, listen to others even if u don't agree, just listen and approve.
when u finish, they will randomly choose 3-4 of you to tell them what is ur decision regarding the topic.
Example of topics: you have a certain amount of money, to which organization would u give, or are u with banning smoking in public or against it, what are the things to improve about tourism in ur country ... etc...
The 2nd group discussion u will have another topic to discuss which is more difficult and u will be less in the group.
Topics can be: ur going to the moon, list 5 main things to take with you, ur on a flight and u had an emergency landing on water, what equipment from the aircraft to take with u, the business class is over booked and u had to downgrade 5 persons, they give u a list of 10 people, who to downgrade to economy, 3 persons that influenced the 21st century...
don't forget to smile all the time, and be friendly and polite, thank the recruiters at all times after they discuss anything with u...
hope this helps!!