McKinsey Growth Marketing & Sales Junior Associate – case focus?

I’m preparing for interviews for the Junior Associate role in Growth Marketing & Sales at McKinsey.

1. What specific case types should I focus on? (e.g., marketing ROI, pricing, customer retention)

2. Are there examples on Preplounge or any other platform tagged for Marketing & Sales roles?

3. Can I skip some case types like heavy ops or M&A, or is broad prep still needed?

4. For a Junior Associate, is the case difficulty lower? Should I expect more foundational questions vs. complex modeling?

Any advice from those who've gone through this process would be greatly appreciated.