There is no "right way to do it", but there is a definitely a wrong way to do it.
The biggest and the most common Personal Fit mistake I've been seeing while being an interviewer at McKinsey is focusing on content vs focusing on interpersonal interractions.
What do I mean by that? You can tell any story from 2 different perspectives:
- Focusing on your arguments and on the content of the problem
- Focusing on how you felt, what you thought about how other people felt, and why you thought other people acted some way or the other – this is the right way
Imagine you are telling the story to your close friend – that's essentially the angle how you want to tell the story. McKinsey wants to know how you feel about other people, how you read other people's emotions and how you interract with other people.
DM me if you want to discuss in more detail or have further questions!