Oliver Wyman did a lot of campus recruiting at my university. I attended several information sessions, including a case interview workshop, and career fairs and had plenty of opportunity to network before applying for the job. Part of the application process was an online timed math/reasoning test. Once I applied, there was another information session and meet-and-greet for applicants. Once I was selected to interview, there was another more informal meet-and-greet with associates at a restaurant in my college town. Networking is very important to them-they value work life quality immensely, and so they want to make sure that people in the company like you and would want to work with you. The interview was a series of two case interviews. I was assigned an "interview buddy" to talk to about case interviews about a week before it took place. I would highly recommended practicing doing cases before the interview.