there is usually online tests and video interview - but because i previously did a insight week I got put through to Assessment Centre . The assessment centre was basically a day long, it had a group task, individual presentation (which you for a brief and could prepare before), a test (numerical and writing emails etc.), then an interview.

6 questions which were all to do with competencies or work situations, one final question on why Aon and investment consulting. Receive feedback within 48 hours on strengths and weaknesses.