Second Administrative Reform Commission is very useful for preparation of General Studies Paper-2,3,4.It hits directly upon the questions asked in UPSC in previous years.The language used is succinct and effective,just what UPSC asks in writing style.It is a treasure of keywords.

Luckily I found Summary of all reports of 2nd ARC which is essentially handwritten notes of D.Amarkesh, AIR 217,CSE-2012.Click here for the notes in the Google drive.