The “Aribam” notes are named after a reputed mentor or author (often associated with Aribam Rajesh Sharma, a known figure in UPSC coaching circles) who compiled exhaustive yet crisp notes for Public Administration. The “640” typically denotes the in the complete PDF, covering both Paper 1 (Administrative Theory) and Paper 2 (Indian Administration).
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The books are widely discussed in the UPSC preparation community. Here's a summary of the general consensus: The “Aribam” notes are named after a reputed