B.Sc

I think B.Sc (honors) is a better option.

You have not write about the college/university name. However, the basic eligibility criteria for 3 years LL.B. Regular course is a Bachelor degree in any discipline with minimum 50% of marks for general, 45% for OBCs and 40% for SC/ST candidates. Therefore, you can be eligible if meeting the above

Yes, you can take admission in M.A. (Journalism and Mass Communication). The eligibility criteria is given below.
Eligibility criteria : The basic eligibility for admission to M.A. In Mass Communication is a Bachelor degree in any stream of minimum 3 years duration. It is not compulsory to have a Ba

The criteria depends upon the college/ institute/ university you are pursuing your B.Sc. Maths programme from. If there is a process to transfer your programme to the other course, then you need to contact the admissions department of your respective college in order to change the programme.