Pramp for Product Managers - Practice product management mock interviews with other PMs
YC Random - Random YCombinator interview questions every 10 seconds
The PM Interview - Practice PM Interview Questions (w/ timer).
Battlecard - Simulate realistic verbal conversations
Speechapp - The simplest way to practice for your next job interview
Apply to YC (Y Combinator) - Curated collection of resources for founders applying to YC.