Economics

Depends on your choice of branches. If you are looking for Pure Sciences, then no, none of the IISERs mandatorily require a Maths background for BS-MS admissions. However, if you are applying for the Engineering Science (EECS and Chem. Engineering) and the Economics programme at IISER Bhopal, then you are required to have a math background in class 11th and class 12th. Also, as a previous answer pointed out, the Aptitude Test has 25% questions from Mathematics. So, if you are a non-math student, you would be well-advised to maybe spend the last couple of months going over a few basics from class 11th and class 12th NCERT textbooks, so as to be able to score a few marks at least in the Math section. Also, if you don't have mathematics in high school, it is advised that you learn the basics, because you'll have to learn the same content much more in-depth in your first year at IISER, and that may prove to be extremely challenging.

Hi,
After your B.Sc (Economics) you can go for M.Sc (Economics). Eligibility criteria for taking admission in M.Sc Economics in most of the top universities is to pass with 50% aggregate marks in any Bachelor's degree. (It may vary with the university you choose.)
Career prospects of M.Sc. Economics are:
Numerous fields are waiting for economic graduates both in the public as well as the private sectors. In the government sector, one may try for Indian Economic Services, jobs in Reserve Bank of India, PSUs and other public sector banks. All these jobs have wonderful career options. These jobs give you social prestige along with financial stability. Private sector also offers jobs for economic graduates in the fields like private banks, MNCs, BPOs, KPOs, Business journals, and newspapers. A good opportunity is also waiting for economic students in higher education. One can pursue Ph.D. in economics to enter into the field of teaching in colleges and universities. It is highly recommended that you do your M.Sc. In a reputed institution for good campus placements and job opportunities. I would like to recommend you some best universities for M.Sc. Course like:
Lovely Professional University- Punjab, Loyola College - Chennai, Miranda House - Delhi, Madras Christian College (MCC) - Chennai, Christ University etc.