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You can refer to Arihant's Banking awareness book, which is very helpful.

The basic eligibility criteria is you need to have graduation from a recognised college.

Eligibility : PG Diploma in Mass Communication is a 2-year postgraduate Mass Communication course, the minimum eligibility is Graduation from a recognised college or its equivalent exam. Admission in this course it depends on the applicant's performance in a relevant entrance test and the consequent round of counseling. Age : A student should have completed 20 years at the time of joining the course. The upper limit is 25 years.

It is B.Sc in computer Science and over this score it is very difficult to get admission in DU. For you I am attaching the official link of the department of computer Science, Delhi University. You can visit this link. http://cs.du.ac.in/programmes/bsc/
This article will help you. https://www.shiksha.com/science/articles/top-colleges-of-du-for-bsc-blogId-16957.

Yes, you can just check the cutoff list of DU and have a admission in the college which is preferred by you.
Best of luck.

Yes, you are eligible for MCA. Prepare well and best of luck.

Usually, CSE and IT branches have the highest cut-off. They go a high as 120-130. So, it is quite difficult to conclude what will be the cut-off for this year.
Keep trying for other branches as well.

Yes, you can get admission. http://www.rknec.edu/AdmissionMBA.aspx follow this link for complete admission details.

Now, B.Ed is essential for all teaching posts. For becoming PGT teacher, you have to complete your post graduation.