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Product Description:Khan Sir Science Spiral Class Notes – Biology, Chemistry & Physics (Hindi, Paperback)Prepare for competitive exams with Khan Sir’s Science Spiral Notes, a complete set covering Biology, Chemistry, and Physics in Hindi. Designed in a concise spiral format, these notes make learning easy, quick, and exam-focused. Written by Khan Sir (Patna), these notes are highly useful for UPSC, BPSC, SSC, Railway, Defence, Banking, State PCS, and other competitive exams.The spiral binding allows students to read, revise, and carry notes comfortably. Each subject is explained in simple Hindi language with important concepts, formulas, diagrams, and examples to strengthen understanding.