I hear that preparation is key to getting the job, does not matter how good or bad you are , as a product manager in your current job. Is Glassdoor the best place to look for past questions and practice ? Any other web sites or prep approach materials that you would recommend. I am interviewing for Group Product Manager job. Regarding background: I have been a product manager all my life ( more than 10 years).
Start with this post: https://www.rooftopslushie.com/request/Google-Product-Manager-Interview-311