After NCERTs, move to standard reference books — one per subject. These are your main texts for Prelims + Mains.
Polity: Indian Polity — M. Laxmikanth
Non-negotiable. Read 3-4 times. Bible for Prelims + Mains GS-II.
Modern History: A Brief History of Modern India — Spectrum (Rajiv Ahir)
Chronological, exam-focused. Pair with NCERT Bipan Chandra.
Art & Culture: Indian Art and Culture — Nitin Singhania
Comprehensive for culture, architecture, dance, music.
Geography (Physical): Certificate Physical and Human Geography — G.C. Leong
Classic. Read alongside NCERT Class 11 Physical Geography.
Environment: Environment — Shankar IAS Academy
Must-have for Environment & Ecology sections of Prelims.
Economy: Indian Economy — Ramesh Singh OR Sriram's Economy Notes
Pick one. Ramesh Singh is detailed; Sriram is concise.
Ethics (GS-IV): Ethics, Integrity and Aptitude — Lexicon (Niraj Kumar) OR Subba Rao
Lexicon for beginners; Subba Rao for depth.
International Relations: Current Affairs compilations + MEA website
No single book works. Use monthly compilations.
Internal Security: Challenges to Internal Security — Ashok Kumar & Vipul
Covers GS-III internal security portion.
Atlas: Oxford Student Atlas for India
Essential for Geography. Practice map-based questions.