Colleges in Assam

IIT Guwahati is better as it is one of the old IITs and it enjoys better placements, academics, culture, campus life, etc.

Dear Ankita,
For necessary information about the questions in entrance exam of Assam University for M.A in mass communication please visit the official website of university.
Website:- http://www.aus.ac.in

Yes,
The Joint Admission Test for M.Sc (JAM) - This exam will be held in the month of February every year. If you are willing to pursue career in Pure Sciences and Research, then IIT JAM is the perfect M.Sc Entrance Test for you.
It offers 1000+ seats in pioneer IITs and IISC for Masters in Science and Ph.D. Courses.

Eligibility:
ST Category
Qualification
Minimum Eligibility
Graduation
40%
University Written Test
-
Admission Process
Register and Apply
Interested candidates can apply online/offline with required information.
Merit Screening
Admission is based on the marks obtained in graduation.
Candidates who have done their graduation other than Dibrugarh University have to appear for the entrance test conducted by the university.

Please check for your eligibility to pursue this course from Gauhati University is mentioned at the link provided below. Details regarding admissions for this course is also mentioned at this link. Regards.
https://www.shiksha.com/science/course/m-sc-in-computer-science-gauhati-university-guwahati-90326

Hello Tribeni,
You are stuck with what us popularly called as Shakespearean dilemma. My opinion is that both these courses have tremendous potential. But my advice would be for you to choose between them the one which fascinates you the most.
Best wishes.