Amazon Device Associate interview questions

I got a mail from the Hr Arun from Amazon .The first round was apti where there were basic english questions and math basically later two techincal rounds and the one Hr round ... The interview process in Amazon is the just a waste of time they called so many people for the vacancy and short listed the people who had a good reference. after the second round of technical which ended arround 1:00 they made us wait saying that we were selected for the next round and we were waiting till 5:30 in the evening just to here that we weren't selected for the third . They don't value your time and efforts . Just for an eye wash they conducted the interview just to select the people they wanted or who had reference . since it was 5:30 and was time to go home even though we were selected for the second round they didn't take the interview.