Hey there,
Congrats on making it thus far!
So, this can basically go two ways:
- First, you get the offer and the Sr Partner just wants to have a chat and convince you to accept it right away (the same thing happened to me). In that case, you don't have to worry at all
- Second, they want to continue their evaluation for some reason (see below)
Now with the mindset of being prepared for everything that might come, let us dive deeper into the second possibility:
Extra rounds are common
- if you demonstrated a couple of spikes in several dimensions, for instance, idea generation, structuring, chart interpretation, PEI, etc. (strong hiring recommendation)
- but did not cover enough ground in another dimension, for instance, in your case the quant section of the case (rejection)
Now there is a huge discrepancy between the two. Most candidates do not show enough spikes besides their weaknesses which makes such decisions easier. In your case, you really impressed the interviewers so they want to give you another chance on the area they could not agree on.
They want to see if your weaker areas are outliers or rather the rule so the partner conducting the interview will definitely drill down into those.
Prepare the following way:
- Figure out what your weaknesses are
- Actively work on them, go through case books and work on all the related problems you can find
- Create an error log to see what types of questions you are struggling with the most, drill deeper into those
- Work with a coach to make this more efficient and focused
Have a look at my McKinsey-specific tutorials on the case and PEI:
Case: https://www.preplounge.com/en/mckinsey-interview
PEI: https://www.preplounge.com/en/mckinsey-pei
Cheers,
Florian