Hello Shambhavi,
For pursuing mass communication you don't need extra thing. All you need to do is to apply for the colleges which offer mass communication. As majority of colleges take entrance exam for offering admission in course followed by counselling.
Few of the good colleges offering mass communication are:

Symbiosis Ceny For Media and Communication (SCMC),Pune.
It is one of the good college. For taking admission in this you need to apply for SET which is for students seeking admission for ug courses. While applying for it choose this as your option and fill the form. Forms are available. Just google symbiosis ug entrance 2019.

Delhi University
Under this many colleges like Lady Shri Ram college, Indraprastha college and etc.. offers the course.
For this you need to check the criteria for admission as for few courses DU take entrance exam.

Christ University Bengaluru

K.C. College of Arts, Science and Commerce, Mumbai

Xavier college Mumbai
Here again you have to appear for entrance test separately for the course.  You need to keep a tab of date when forms are available.

These are few good colleges are there. You can also look into by ourself.
Just right now focus on 12th and simultaneously apply for the Colleges and after the boards study for entrance.

I hope this helps you.

All the best!!

Hi Shambhavi.
Greetings.
For taking mass communication as a course there are various college you need to apply for which are as follows:
1.LSR,Delhi
2.ACJ,Chennai
3.IIMC
4.XIC
5.IIJNM
Thanks and all the best for 12th exams.