After I found out I got a first-round interview, the Recruitment Coordinator for my campus set up a conference call with other interview candidates and some McKinsey consultants to walk us through the first round interview process. I was then contacted by a McKinsey "coach" who spent 45 min on the phone with me preparing for the case interview. Night before the interview I took a problem solving test with other first round interview candidates at my school. The actual first round interview consisted of two 45 minute interviews. Each was about 15 minutes of fit, then half hour case. The fit portion was very specific; one interviewer asked about a leadership experience, while the other asked about a time when I had a disagreement with someone. They then both asked many follow-up questions to get every detail of the situation I was in. There weren't any questions about why consulting/why McKinsey, which I found surprising. The cases weren't too bad, more specific and interviewer-led than other firms.