I'm a student in penultimate year of studies that has McKinsey first round soon. I have 2 questions about McKinsey PEI, maybe someone can give me a hint on what is the right way to approach these issues:
1) The stories that I'm expected to tell, should they be all career/study/extracurricular related? E.g. if I have a story (that I'm actually quite proud of) how I over 2 weeks was persuading one of my friends to seek medical attention for issue he was neglecting, and actually it turned to be quite life-changing for him - would such story make a good "Personal impact - tell us about some instance when you changed a person's mind", or I should prepare solely career-related stories?
2) I come from somewhat non-trivial background (went to business after media), and expect it to be confusing for the interviewer just from the resume. I'm expecting a "tell us about yourself" question where I'd briefly guide the interviewers through my career path and reasons behind it. However, can this part be similar for all of the 3 interviews in first round? I know that leadership/impact/etc. stories should be different, but what about this background-explaining story?