Maths Spl

M.Sc/MA is related to your B.Sc/BA subjects. If you have mathematics in graduation then you can pursue M.Sc.

Yes, you must have maths in HSC to do economics (Hons). However, some private colleges in India offer this course to students who didn't opt for maths in HSC.

Dear Preeti,
To be honest, 51% is not really good for you if you want a boom in your career so firstly focus on scoring more. Now come on to your question, best option for you is M.Sc in your desired field after having some experience. But if you don't want to go for M.Sc then you may opt for MBA.

Yes, you can but you have to pursue B.Sc in clinical psychology and then M.Sc in clinical psychology and then PhD in clinical psychology.

If you are interested in engineering then prepare for JEE Mains and Advanced.

There are many institutes and organisations offering courses in robotics which can be pursued after you complete your 10+2 studies. Please refer to the link mentioned below for eligibility and scope of taking up a career in Robotics:
https://www.shiksha.com/b-tech/articles/your-career-after-robotics-blogId-4610

Even if you haven't opted for maths in higher secondary you can take BCA as your grad but, in most of the cases, maths is one of the two general papers for BCA in college. So, it would be better if you choose a college and find out their general subjects with BCA. Grad level maths is a bit tough but not for those who have studied it in HS.

I guess you would find maths in most courses, however you could try courses in Arts or humanities.
Arts, Humanities & Social Sciences Degree Guides
History Degrees. Psychology Degrees.
Philosophy Degrees. Sociology Degrees.
Social Work Degrees. Archaeology Degrees.
Sports Coaching Degrees. Political Science Degrees.

There are mixed responses about this book. Some claim it is a handy tool to study calculus whereas others claim that there is no practicality to the book as the examples are not fully explained. If you want to learn calculus, this book would be a better buy.
1) Calculus: An Intuitive and Physical Approach (Second Edition) (Dover Books on Mathematics)by Morris Kline