Banaras Hindu University offers a three-year, full-time BSc Geography programme through its Department of Geography. Candidates seeking admission to the programme must have passed the Class 12 or equivalent examination with a minimum of 50% marks in aggregate in Physics, Chemistry plus any one of the following subjects from Biology, Geology, and Geography and must have passed in each of the concerned three subjects. As you have studied Geography, Mathematics and Economics in the Class 12, you can only apply for BSc Geography offered at the Banaras Hindu University if you have studied Physics, and Chemistry as the compulsory subjects.