Science

Hello Sneha, It's very nice indeed to know you are desire to do research in your chosen field. Yes normally speaking the eligibility for admission for a Ph.D. or a doctoral course is post graduation in that subject. However some institutions and universities allow admission for post graduation and research together called dual degree courses. You need to check this from the institutes website where you intend to seek admission. Best wishes to you.

Hello Mansi, It's quite difficult to say as to which topic you should study for passing the examination. This is so since your interest in the subject could be different from that of mine. However I have one suggestion. Please have a look at the question papers of the previous years and then SEE how many questions from each topic are asked and then ask yourself the question as to which topics you would like to leave out so that you will still pass the examination. Best wishes to you.