I applied through college or university. The process took 6 weeks. I interviewed at Thomson Reuters (Mumbai) in Dec 2013
Interview
1)Test (Skill & English written test)
2)HR round ( Basic General questions)
3) Manager Interview ( Manager explained me about the company's work, what I'm expected to do etc)
I was selected immediately but I had to join after almost a month as per their requirements. Over all it was easy interview and does not need any prep.