Be yourself and try to be inclusive of others in group assessments.
Get a sense of the culture and decide if you are a good fit, and if so, sell it.
I would recommend researching the company and making sure you are across their values, things they have achieved in recent years or what they are working towards. Have some examples of past work/experience to draw on, understand why you want to work for them and be honest about what draws you to their program/company. Think of some questions they may ask you and how you would answer them, try and come up with some out of the box questions too.
STAR method - situation, task, action and result. Majority of questions are behavioural based, thus this structure ensures you answer clearly with all the necessary detail