I applied through college or university. The process took 2 days. I interviewed at CESC (Calcutta) in Mar 2015
Interview
First there was shortlisting in which only 15 of us were selected from Mechanical. Then there was a Aptitude test Offline followed by a Group Discussion. The day was called off. In result 10 were there for interview, myself heading the list. On the next week there was a PI before a panel of 6, though I failed to pass through it yet I learnt a lot.