Thank you very much for answering to my question. One more query, I am a maths student in 12th class and I have a dream that I want to find the treatment of at least one incurable disease in my research that is why I want to pursue research in drugs and medicines. If you were in my place, for what Entrance examinations you would have prepared and which courses you would have preferred to get closer to the dream?

If I were in your shoes, I would prepare for both JEE & JEE Advanced, in order to get into BS from IISC. See, this course moulds you into research frame, which will help you immensely in your dream research.