Consulting cases are in some ways similar to PM cases, thus you can better prep for a PM case by going through some of these questions too.
Other Case Question Resources:
StellarPeers: https://stellarpeers.com/
The Ultimate Guide to Product Management Questions: https://andyjagoe.com/the-ultimate-guide-to-product-manager-interview-questions/
Career Net Tech Case Interview Questions
Source:
https://docs.google.com/document/d/1FMmrTowIidYgXxcyq6mZ-SIeaK0OAYq9/edit