B.A

Both are good, it depends on your interest. If you want to remain in Science field, you can opt for B.Sc. And then M.Sc. If you want to go for arts subjects, you can opt for B.A. Later, you can pursue M.A. There are a lot of options available in both the fields.

If you want to prepare for UPSC and SSC exams, you must go for B.A. Because you can focus your mind on UPSC coaching or preparation for it. And B.A. Is an easy course so you can get graduation done too. And B.Sc. Is a bit though and you have to divide your focus on both sides.

https://www.jmientrance.com/recommended-books/
See these books.

50% is required.

The cutoff is around 60-70.

Almost all the top universities conduct test for admission, Jamia Milia Islamia, Delhi which is among the best also conducts test for this course, you can also look for Delhi School of Journalism, Delhi University.

It is difficult to say that you are eligible as
the minimum eligibility criterion required for the candidates is to possess a Bachelors degree in English or a relevant discipline from a recognised university with a minimum aggregate score of 60%.

As such, there are no minimum eligibility criteria for IELTS set by the conducting bodies of IELTS. Anyone who wishes to pursue higher studies abroad or wants to work abroad can attempt the IELTS exam (both Academic and General Training). However, candidates should always check the eligibility criteria set by the educational institution or organisation where they are applying.