Toppers Booklist for UPSC Prelims book list Polity - Laxmikant Economy - Sri ram IAS book on economics Environment - Shankar ias book Geography - 2 NCERT of class 11 + Vajiram handwritten notes Ancient history - RS Sharma NCERT Medieval History - Satish Chandra NCERT (for ancient and medieval, i didnt do these as my optional was history) Modern history - Spectrum Culture - Class 11 NCERT + Nitin Singhania (Book) Science and Tech - Vajiram hand written notes Current affairs - Vision monthly magazine + do extra modules from any institute for environment, economy, S&T current affairs Mains book list GS1: History, Culture, Geography - same sources as above Society - Society NCERT + internet research on topics in syllabus + Mains365 GS2: Polity - Laxmikant + Mains 365 Governance - vision value added material + Mains365 IR - Mains365 GS3: Economy - same as above + Mains 365 Agriculture, PDS - internet research for basic understanding of topics + Mains 365 S&T - same as prelims...