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an immense pleasure to prescht before you all a comprehensive study of Biology, Physics and Chemistry most suitable for aspirants preparing for UPSC, State PSC, SSC, Railways. APFO, RRII and other competitive examsThe book has been meticulously crafted to provide a basic insight into general concepts of science at the very preliminary level. Scientific concepts and related topics are explained taking into consideration the requirements of the aspirants and the examinations. We have tried to make the book understandable and inclusive for students belonging to all disciplines keeping the language as simple as possible.The book is presented in the most simple, explicit and lucid manner, with labelled diagrams, tables and Howcharts: segmented into various units enriched by appendix at the end of each section to cover almust all the relevant topics. Each and every concept is supplemented with examples and applications, to provide an understanding of the topic and serve the needs and trends of examinations.