By critically reviewing your online submission, you might still spot some mistakes or areas of improvement. Some tips:
It might be very useful to do some prior research on 180DC or the Leuven branch in particular to come prepared to the interview.
While definitely not a neccesity, it can be helpful to look at some cases beforehand and get comfortable with them.
Being a teamplayer and working in a group is key to delivering a succesful project. Therefore, not only should you show this in your group case, but you should also prepare for questions about this ability.