Mine was a campus selection. As usual, the initial shortlisting was done based on an aptitude test. very basic test which required no specific preparation. quants was okay but english was extremely easy. after the aptitude results were announced, interview process started. for most of the guys, it was a simple 5 min interview, but for me it lasted well over 20 minutes. apart from the usual HR questions, the interview also asked a puzzle and few questions from electrical engineering.