Sources of questions and prompts

Car Wash - Great sample with crowd sourced answers to a product sense/design question

Question Library - Medium Article

Facebook - Sortable Sheet request required

Questions from around the interwebs - Sortable Sheet

Tips & Tricks for Facebook - request required

A mix of question types for some FAANGs in spreadsheet form

Technical PM Interview

Interview Cake - This is a great system design questions. I highly recommend their service. Worth the monthly charge.