Pramp for Product Managers - Practice product management mock interviews with other PMs
Product School - The global leader in product management training
Speechapp - The simplest way to practice for your next job interview
The Product Folks - A volunteer-led community of product managers and makers
Xobin - Most Comprehesive Pre-Employment skills testing and Psychometric Assessment Platform.
Intercom on Product Management - The ultimate resource for aspiring product managers