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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.

A proper strategy to start would be studying with complete concentration, no disturbances, and continuously for 3-hour sessions. Yes, we know the thought itself sounds alien to you, but you have to start somewhere. The idea is to simulate real exam conditions. While studying, you have to create an atmosphere of sitting in an examination hall. You can choose your own time table to prepare for all the topics of class 12, and if you are preparing for an exam like JEE you can also include those topics in your schedule. It all depends on what suits you best, and which topics you would like to cover first, second or third, based on your comfort levels. Do not undermine your CBSE NCERT books, as they are the best to practice with. Don't overdo the practicing from heavy reference books, but instead ensure you first master the prescribed syllabus textbooks. Solve old question papers, take mock-tests and quizzes, and ask your seniors for some tips in mastering the tricky areas. The more you practice, the better you will get. Its no wonder that they say Practice makes perfect!

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.