Walmart QE Engineer III interview questions

Except managerial round all other rounds were ok. I got call from HR after employee referral. I brushed up all the java concepts from javaconceptoftheday.com and datastructures from geeksforgeeks site... Selenium and API testing also prepared. First technical round asked about usual interview question..Second technical round asked about data structure questions from linkedlist and arrays...Thrid in managerial round, he asked me about my current organization framework for both UI and API..he asked me to write code for API ...Challenges faced and some behavior questions All three rounds happened on the same day and HR informed me that they ll let me know my result in 1-2 days...after 2 days I called HR and she told that senior managers decided not to go proceed further with my profile.. After a week again I got a call from HR that I have to attend manager round but this time different manager..I went again to attend manager round , the discussion went only for 30 mins..it was like HR round...next day i got update from HR that manager rejected your profile due to not strong in technical ...he didnt ask me any technical questions but he gave me feedback that im not strong technically..simply wasted my time...