Codilar Technologies Megento Developer interview questions

It was a 2day process with 1round - aptitude (c and c++) 2round - written coding where the valuator Google's the answer and expect us to have the same code written 3 round -was technical hr asked about js ,PHP and more I answer almost all 4-round - technical hr again in the office same damn questions by other person with mysql ,pointer and logical reasoning 5round - CEO round again asked technical stuff told me to write a schema diagram I wrote he told I'm good .and atleast they rejected . I have no idea why after clearing all these rounds and doing the final round well.