Real Dev - Real-life coding skill challenge
Software Product Management Stack - Resources & tools to help you manage your software product
hackattic - No nonsense, real world programming challenges
The Product Management guide - A book on how to create and ship products that people love
HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
Product Management Exercises - A repository of product manager job interview exercises