Gagan Pratap Sir’s Complete 2D Mensuration session for SSC CGL/CHSL offers a comprehensive overview of essential topics, including triangles, quadrilaterals, polygons, and circles. The session emphasizes "Maths Concept King" techniques, such as proportionality rules and triplet mastery, to solve complex, high-weightage geometry problems efficiently. Watch the full session on the Gagan Pratap Maths YouTube channel .