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These are – they are legitimate, watermarked for your account only.
Physics requires active practice. Solve the text questions in your NCERT book before moving on to reference books like S. Chand, H.C. Verma, or Pradeep.
Regarding the "patched" version you mentioned, I want to emphasize that using unauthorized or pirated materials can be against the law and might not provide the best learning experience. Instead, consider purchasing a legitimate copy of the textbook or exploring alternative resources.
The glow of the laptop screen was the only light in Rohan’s room at 2:00 AM. His physics exam was forty-eight hours away, and his physical textbook was currently a soggy mess at the bottom of a monsoon puddle. Desperation led him to a flickering forum thread titled:
Borrow a physical copy from your school or local library for free.