If you are a student preparing for Indian competitive exams—specifically UPSC Mathematics Optional , IIT JAM , or state-level PG Entrance exams —the Krishna Series book on Analytic Geometry is considered a standard reference. It is widely regarded as essential for the "Conic Sections" and "3D Geometry" portions of these syllabi. Cyberlink: Youcam 10127171 Preactivated App Top