I went on a group interview once and they ask stupid questions like......if you could be a fish, what fish would you be and why? And they asked me to build a house out of cards and then i had to sell the house of cards to them.
And don't forget to say you are a team player and that you work well as part of a team, give examples, like clubs you've attended or hobbies you're part of, if you have none then make them up!