Dear Shashwat, when an Accademic programme is designed, it is designed so as to prepare you for a world of higher studies or a career. So the curriculum of a  B.Sc degree is designed to be spread over 3 years. The minimum duration that this course needs to be studied in is 3 years. There are no 1 year B.Sc courses and you cannot attempt a 3 year course in 1 year. There are diploma courses that run for a period of 1 year.