Applied through the career center at my school and got an email within a week to attend an information session at their office. Information session consisted of a presentation on what Northwestern Mutual does. After the session, those who still wished to pursue the internship had to answer three questions (about a page long) and take a personality test. After that I was emailed for my second interview which was a behavioral interview. Here I was given more "homework" which consisted of completing a market survey, aka write down/talk to personal contacts who would be interested in buying insurance and other products. Third interview discussed my survey and was offered the job. Easy process.