Following are the standard books that can be followed for Sociology as mains optional subject:
NCERT- 11th and 12th
IGNOU material for Sociology (helps in basic understanding and helpful for new topics in paper-2)
Classical Sociological Theory-George Ritzer
Tribal India-Nadeem Hasnain
Modernization of Indian Tradition-Yogendra Singh
Changing India-Robert Stern
Indian sociological thougt- Nagla
Social Change in India- M.N.Srinivas
Apart from this, with changing trends in UPSC papers referring to KURUKSHETRA and YOJANA and providing case studies linking answers to present day issues wouls also help.
Regarding coaching and class notes, Upendra Gaurs class notes provide a very good start in terms of what to study and how much depth is required in a particular topic from syllabus. Even Vajiram's Mahapatra has been recommended by a lot of toppers in past.
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