Entrance exams are generally based on checking your Aptitude and interests in the particular field.Since Mass media is into the creative fields with specific areas related to Journalism, Advertisement and PR.So your tests would be to check your Aptitude in these areas and your creativity in those areas. Also they would check your writing skills and expressing yourself verbally and non verbally. So the entrance exam would ask you to write an essay or be creative  in terms of Effects of media Fastest means of reaching the people and why. Then there may be situation wise