it was a two stage process there was a written test followed by interview which is based on the discussion about the question on written test.Written test has five question two on oops and remaining three on graphs.For getting selected for the interview on must do at least two question.In the interview they will discuss those questions only and some c++ question like reference variable. there is some time between written test and interview during that time prepare those questions also you are not able to attempt as well because they will ask you to attempt those questions as well in the interview