First round was the aptitude test which contained simple questions. Even after attempting all the questions and being very sure that almost all of them are correct, the interviewer told me that not even half of my answers were correct. When I asked him to show me my answer sheet, he refused to show it. I was ready to even challenge him about my answers.

Very long and tiring interview process (8 hours). First there was aptitude test followed by statistics test. Then there were 4 rounds; first with HR, two technical interviews (involving puzzles) and last was director interview which was basic one involving introduction, life goals and background.