Delhi University (DU)

You need to appear for an entrance test . Delhi University MCA Entrance Test is directed by the University of Delhi for admission to Master of Computer Applications (MCA) course. Admission to MCA course is based on entrance test and interview. While preparing the final merit list, 85 percent weightage is given to score in entrance test and 15 percent weightage is given to score in the interview. This entrance test consists of objective type questions and checks aspirants mathematical ability, knowledge in computer science, logical reasoning skills and english comprehension. Foreign nationals are exempted from appearing in this entrance test.
Eligibility for Delhi University MCA Entrance Test :
Bachelors degree in any discipline from the University of Delhi with atleast one paper in Mathematical Sciences (Mathematics, Computer Science, Statistics, Operational Research) under annual mode/at least two papers in Mathematical Sciences (Mathematics, Computer Science, Statistics, Operational Research) in semester mode or an equivalent degree.

Yes, you are free to join PG in mass communication after you complete your B.Sc. provided you clear all your papers and do not have back logs at the time of admission. Please refer to the link provided below for a list of colleges which offer courses in Mass communication at PG level.
https://www.shiksha.com/mass-communication-media/articles/top-10-mass-communication-colleges-to-join-at-pg-level-blogId-8790
The basic eligibility for admission to MA in Mass Communication is a Bachelor degree in any stream of minimum 3 years duration. It is not compulsory to have a Bachelor degree in Journalism or Mass communication but it certainly gives an edge.
There is no restriction with respect to stream of education in graduation. However, certain universities do not accept application from students who belong to Engineering or Medical streams.
Most of the universities do not follow age restriction but there are some universities which do not allow any candidate above 30 years of age.
Work experience is not compulsory but universities do prefer students with prior work experience in the field of media and journalism.
How to Get Admission in Master of Arts [MA] (Mass Communication)
The process of admission to MA in Mass Communication is through an entrance test conducted by respective institutes. The process of admission is best explained in the following Steps:
Entrance Test
Personal Interview
Admission