I am glad that you are so clear about what you want to do after 12th. Here’s is list of all the extrance exams that are conducted in India for admission to an undergraduate program in mass communication. https://media.careers360.com/exams/UG

You would be able to see some basic information about the entrance exam such as Application date, exam date, exam format etc right on this page and if you wish to know more details about the exam that interests you, you simply have to click on it and you would know everything from eligibility to application details to exam fees and its pattern.

I am sure you would have specific questions after you do this exercise, feel free to ask. All the best