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This comprehensive set from Khan GS Research Center, curated by the renowned educator Khan Sir, includes four subject-specific books: History, Polity, Geography, and Economics. Designed for competitive exam preparation, these books present key concepts, facts, and explanations in an easy-to-understand manner, making them ideal for aspirants of UPSC, SSC, Banking, Railways, and other government examinations. Each book combines clear explanations with relevant visuals to enhance learning and retention.