Amazon Software Development Engineer interview questions

At first they send me an online assessment It was a little bit easy then after that they schedule a phone call interview for half an hour I was asked some technical questions and also a behavioral questions then I was invited to one : one interview and they send me an email for all the preparation needed there were four interviews each one for an hour and focus on a particular technical side and also one or two behavioral questions

The Interview process is confusing.. After applying at amazon careers, - got an email to write online test, 80% of the test cases were passed. - Didn't get any response from the recruited was initially assigned - Got call from another recruiter and scheduled for Paired Programming - Answered all the questions correct but the efficiency of the program i wrote was bad.