GS Mains syllabus has undergone an overhaul last year. The syllabus has been defined under four papers each containing topics related to history, world history, geography, S&T, environment, social issues, human development, Indian economy, etc. Though the topics seem to be of conventional areas but the questions are analytical and multi-disciplinary in approach. Here the subjects have been divided into sub-topics to give you a better understanding and comprehension. Each section has been compiled under the following headings to give step by step guidance.