Test preparation

Hi Abhinay,
I suggest a systematic (even methodical) approach, in which you take the time to master each topic/concept (e.g., percents, ratios, assumption questions in critical reasoning, comparison questions in sentence correction, etc).
So, for each topic/concept, you should:
1) Learn the underlying concepts (rules, attributes, notation, etc.)
2) Learn GMAT-specific strategies related to that topic
3) Practice dozens of questions all related to that one topic.
4) Don't stop working on that topic until you have mastered it
Then, and only then, move on to the next topic.
In addition to learning the core concepts and GMAT-specific strategies, be sure to work on your endurance and test-taking skills (e.g., time management) by taking several practice tests.
Feel free to ask for more.
All the best.

First, you should get your hands on previous years 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, 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 an 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.