Book excerpt: INDEX Note for Students 1. Essay Writing • 1.1 Important Tips before you start writing the essay • 1.2 18 Most Important GS Paper I Topics for IAS Mains 2019 2. GS Paper I: Indian Heritage and Culture, History and Geography of the world and Society • 2.1 Important Tips before you start writing the essay • 2.2 25 Most Important GS Paper I Topics for IAS Mains 2019 3. GS Paper II : Governance, Constitution, Polity, Social Justice and International Relation • 3.1 Important Tips before you start writing the essay • 3.2 25 Most Important GS Paper II Topics for IAS Mains 2019 4. GS Paper III : Technology, Economic Development, Bio- diversity, Environment, Security and Disaster Management • 4.1 Important Tips before you start writing the essay • 4.2 25 Most Important GS Paper III Topics for IAS Mains 2019 5. GS Paper IV : Ethics, Integrity and Aptitude • 5.1 Important Tips before you start writing the essay • 5.2 25 Most Important GS Paper IV Topics for IAS Mains 2019 6. Sample Answers to IAS Mains Questions and Essays • General Studies Paper I • General Studies Paper II • General Studies Paper III • General Studies Paper IV • Essays