There are 4 stages of interview.
The first stage is a group discussion. Try and be articulate but do NOT be pushy. They are trying to see if you can work as a team, accept other people's ideas and distribute work evenly.
The second stage is a presentation. They will ask you to randomly pick a topic and speak on it for 2 mins. Can u think on ur feet? Can u articulate ur ideas? How good is ur English? Are u presentable?
The third stage is a simulation. They will ask you to read a scenario and ask you to profer solutions. Can u think outside the box? Are you analytical? Are you ethical?
The fourth stage is the normal one on one interviews. Tell me about urself. What are ur weaknesses. What can u offer us?
Everythin is one day. 2-3 hrs and ur done. The results come out in like 2 weeks. (when they told u it would come out during the test).
Wish u luck!