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TOTAL NUMBER OF PAGES IN NOTES BIOLOGY-143,PHYSICS-127CHEMISTRY-83This book covers all fundamental and advanced topics in Biology, tailored for competitive exams like UPSC, SSC, Railway, and State PCS. Authored by the renowned educator Khan Sir, the content is simplified for easy understanding, with clear diagrams and real-life examples. It includes chapters on cell biology, human anatomy, botany, genetics, and more, making it a reliable resource for general science preparation.This Chemistry book by Khan Sir is designed for aspirants preparing for general studies and science-based sections of competitive exams. It includes concepts from physical, organic, and inorganic chemistry explained in a student-friendly manner. Diagrams, molecular structures, and periodic table trends are covered thoroughly to aid conceptual clarity and retention.A highly useful Physics guide curated by Khan Sir, this book offers a conceptual and practical approach to understanding the fundamentals of physics. Topics such as motion, laws of Newton, electricity, optics, and modern physics are presented in an easy-to-follow format. Ideal for SSC, Railways, NDA, CDS, and other one-day exams, this book simplifies numerical problems with clear examples.