There are two online tests to begin with, one numerical and one verbal. After this, there is a telephone interview where they ask basic competency questions (look at their website). If you get past that, they invite you to an assessment centre where you have to write a business report, do an e-tray exercise (pretty standard stuff). If you apply for an internship, you bypass the group task and the interview on the assessment centre day. Instead, at the end of the internship, you have a far more relaxed partner interview.