Amazon Senior Project Manager interview questions

This is PM for operations/logistics systems. Three rounds phone interviews, each of one hour. 20-30% behavioral questions + 70-80% case interviews.Cases may not be directly linked to this position, such as how to price Amazon Prime, how to manage the capacity of the warehouse (what factors you need to know, what are the relations between these factors, how to get these data, etc)., why sell neg profit margin goods. Overall, to answer them well, you need to have some knowledge of microeconomics, economical theory of organization, and maybe operations/logistics (I'm not sure. this is not my major). Then you need to be very logical. The intervals between three rounds are half a month and a month! The most dramatic part is that I was forgotten/overlooked after being told the third round feedback was good. After my tenacious try to get connected with HR, the final on-site interview was scheduled in Seattle two months after. four back-to-back interviews, totally three+ hours. Similarly, 60% of the time was case interviews. They asked many details and questioned my solutions. But I think this is a good way to test the logic and way of thinking of the candidates. 40% time were about behavioral questions and prior experiences. Due to NDA, I can't disclose specific questions. But one question already asked during phone interview (also listed above) was mentioned by three of them. Because my English is not that good and I am not quite interested (so I didn't prepare much), I didn't perform well on site. Thank you letter was received upon inquiry one week later, because HR, again, forgot to send it out.