How would I approach it?
1. Read the 2 articles I wrote on the McKinsey interviews to get started.
- Case: https://www.preplounge.com/en/mckinsey-interview
- PEI: https://www.preplounge.com/en/articles/mckinsey-pei
2. Conduct structure, chart, and math drills; work on your perceived areas of weakness and the areas you got negative feedback on during your previous application more so than on the other areas. Your goal should be to create a strong baseline performance across all question types and stand out in 1-2 specifically.
3. Practice with other experienced peers. Quality over quantity and I would recommend in total maybe 20 peer interviews
4. Read through McKinsey publications to get a feel for their language, phrases, communication, current hot topics, etc.
5. Draft your PEI stories as per the article linked above. Write 2 stories for each dimension and practice them out loud
6. If you want to speed the process up and know how a real McKinsey interview is done from start to finish with a clear process and all the tricks you need to know to perform at your best, let me know.
In total, I would invest between 100-150 hours over 12 weeks. That amounts to around 8-12 hours a week. Don't forget to include breaks to reset your mind.
If you are not working, you can decrease the prep time to 6-8 weeks.
All the best with your application!