I do interviews for a large consultancy (probably hated by people on here as well!). My tips would be:
– Look beyond the company website and know at least 5 / 6 competitors and recent deals the company has won (just look in a business news website)
– If they ask don’t say you haven’t applied anywhere else – having several applications on the go shows that you are serious about the career you’re pursuing
– Have a coherent answer as to why you’re applying – ‘i need the money’ is not a good answer
– See if they’ve indicated it’s a competency based interview – assuming they have (most grad ones are in my experience) make sure you practice writing out some answers to the obvious ones (e.g. give an example of how you tackled a difficult situation, explain how you dealed with a difference between two team members, give an example of how you tackled a vaguely defined problem, how have you supported a team member)
– Always apply the STAR technique when answering – Situation (context), Task (what you had to do), Action (action *you* took), Result (what happened)
– Don’t say “We did this” they’re interested in what *you* did
– Don’t panic – take your time to answer, the interviewer is probably nervous as well
EDIT: Just noted that the interview is in the past! Glad it went well 😀