Hi Ramu Kumar,  Firstly you go through your previous years papers of your college entrance exams.Try and answer them, it will give you an ideaas to what line of questioningthe exam takes.In general Mass Communication and Journalism entrance exams test English Grammar, Writing Skills, Knowledge of Current Affairs and Critical Writing ability. Critical writing is not criticising but being able to grasp and break down a problem to explain it then offer probable solutions or answers. 

Reading newspapers, knowing the media landscape, watching news television and trying to understand why Arnab Goswami shouts so much, why newspapers write in a certain way and why news on internet portals is so different are some of the things that you may need to know and answer. There will be questions on Media Policy, Laws, Ethics, Films,  Books, controversies, free speech, election propaganda, news coverage and so many other things.  

Good luck!