Dear Student,
Your question is not clear. It is not possible to change the subject in the second year or third year of B.Sc course. If you are taking fresh admission, then you can change the course before the admission deadline. According to UGC rules, whichever combination or course you chose in the first year will continue for the second and third year. However, in the second-year of UG courses, you will have an option to choose an elective subject, but you can't replace the core subjects. Please make your question more clear so that we can provide you with a detailed information.
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