University of Mumbai [MU]

Yes, your friend can study MA in English from Mumbai University as the minimum eligibility criteria for admission in this course is that candidate must have passed a graduation in any discipline from any recognized university.

I think you have been considered to drop your course, therefore you will have to retake the admission.

Yes, you can do this Diploma after your 12th from Kazian School of Management, Miraroad (East) Thane and there are other two, which provide online and part time classroom education for this Diploma. The information for these two is given in the below link.
Link- https://www.shiksha.com/accounting-commerce/taxation/colleges/diploma-courses-mumbai-all

Hi,
Please specify which college you are talking about as it might be difficult for you to complete your graduation but, it is not impossible.

Hello Student,
Yes, you can be provided with extra marks if you have answered properly. You need to crosscheck with your answer sheet. If not, don't worry, work hard and I believe that you can do it.

the course require minimum 50% in class 12th. There are certain colleges in Mumbai University that offers the cost and you need to crack the entrance exam for it and selection will be based on your performance in the exam. 

Hi,
The duration is of four years and getting to know about the colleges in Bangalore you can check the following link:
https://www.shiksha.com/mass-communication-media/radio/colleges/diploma-radio-jockeying-colleges-Bangalore
Thank you.