Large organisations like KPMG are likely to run many assessment centres throughout the year – which means that there should be lots of information you can find out before the event. Contact them and find out what competencies you are being assessment against and what type of selection exercises you will be doing on the day. Then start preparing. You should find all the information you need about the selection exercises on this website. Don’t forget, if the assessment is a full day and a lunch is included you are still likely to be observed – so don’t relax too much. Good Luck!