Amazon Senior Vendor Manager interview questions

After applied on amazon website for the open position, I've been asked to take an online test (numerical reasoning, GMAT style). Then I've been contacted for two phone interviews (manager in similar position and HR) followed by one day interviews in Milan. Behavioral question all along: describe your CV, describe a difficult situation at work and how you handled it, describe a case in which you failed, describe a success, etc. At the end of the first phone interview I was asked few quick math question to verify the online test.