Why do people wish to live in either in the past or think about the future and worry instead of living in the present. Dude you are in your first year, if you study all your subjects properly there won't be any problems during the placements. Stop worrying.It will take only some weeks practice to answer the trick or IQ questions that the interview may ask. And anyway they won't make you the chairman straightaway if you start preparing for the interviews now
. Enjoy your college life.
P.S.And tell me why placements. Will B.Tech satisfy you? Why think about a job after B.Tech? Do M.Tech or M.Sc. or any other higher degree.