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The pattern for entrance exam of BA Mass communication is as follows:
Module: One
Communication: Definition and functions; Types of Communication: Intra-Inter-Group-
Mass Communication; Means of Communication: Press, Radio, Television, Film, Internet, Cable Network; Media-Society Theories: Mass Society, Mass Culture and Mass
Audience; Normative theories, Functionalism, Critical Political Economy, Marxism, Information Society; Frankfurt School of Communication; Mass Media in India. Module: Two
Communication models: Aristotles classical model; Laswells model; Shannon-
Weaver's Mathematical model; Wilbur Schramms model; David Berlos model;
Newcomb's model; Westley McLeans model; George Gerbners model; Media
Dependency model; McCombs and Shaws Agenda Setting model; Chomsky-Hermans
Propaganda model; Development Communication and Diffusion of Innovation;
Dominant Paradigm; Uses & Gratification; Globalization and Mass Media. Module: Three 25 Marks
Definition and different types of Media Management; Ownership patterns of Newspapers
In India; Corporatization and Monopolization: Changing nature of Newspaper
Management; Cross Media Ownership; FDI in Media; Various Departments of
Newspaper; Dual Economy of a Newspaper: Circulation and Advertisement Management
Of electronic Media; Public Control, Private Control; Autonomous model; Prasar Bharati;
Cable TV Regulation Act; Organizational Structure of Doordarshan and All India Radio;
Convergence of Media; DTH, TRP, ABC, NRS; Satellite Channels. Module: Four 25 Marks
Freedom of Information; Right to Information; Freedom of the Press with special
reference to India; Press Commissions; Press Council; Press Laws: Defamation, Contempt of Court; Sedition, Official Secrets Act, Copyright Act, Press and Registrations
of Books Act, Obscenity Act, Working Journalist Act, Parliamentary Proceedings Act;
Codes of Ethics; Yellow Journalism.

First, you should get your hands on previous year's papers of the college entrance exams. Try and answer them. It will give you an idea as to what line of questioning the exam takes.
In general, Mass Communication and Journalism entrance exams test English Grammar, Writing Skills, and Knowledge of Current Affairs and Critical Writing ability. Critical writing is not criticizing, 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.
After getting through the entrance test there will be a personal interview, which will test whether you have the content to back up your statement of purpose from the test. Basically, you need to know everything under the sun. Sounds intimidating and it is but it is not impossible.