Pariksha Vani books by S K Ojha are very popular books among hindi medium students preparing for IAS, UPPCS, BPSC, MPPCS, RAS and other state level civil services examinations. Pariksha Vani books (Boudhik Prakashan) including Indian Geography (Boudhik Prakashan), World Geography (Boudhik Prakashan), Astronomy (खगोलिकी), Pariksha Vani Indian Polity And Constitution (Bhartiya Sanvidhan Evam Rajvyavastha/ भारतीय संविधान एवं राजव्यवस्था), Pariksha Vani Agriculture And Technology (Krishi and Prodhyogiki- कृषि एवं प्रोद्योगिकी) by S. K. Ojha, Population and Urbanization, Ecology and Environment (पारिस्थितिकी एवं पर्यावरण- एसके ओझा), Biology, Physics & Chemistry, Indian Economy etc all are equally popular.