Questions will be sent in mail as part of 1st round, which contains mixed things like quants, regx, and some logical reasoning. 2nd round is Telephonic interview where a techie shoots out questions with includes general knowledge too. Well the final round is F2F with the technical person, with some questions on paper, gives time to solve them. Summing up everything, the technical person is very supportive and makes us to rectify our mistakes made in the previous round and he tests your learning ability. Presence of mind is very important, make sure that you focus on the problem. One of the best interview I've attended till date.