The author of the book, Mr. P. Charles Paul, is an accomplished teacher of mathematics based in Puducherry U. T. He holds a B.Sc.Ed., M.Sc., M.Phil., M.A. Edn., PGDCA., D.Litt. and has been teaching mathematics at the secondary and senior secondary level since 2006, with a track record of producing 100% results in board examinations. He is also a Teacher Educator and Trainer at the District Institute of Education and Training in Puducherry, where he integrates pedagogical principles and utilizes robust ICT tools to facilitate the teaching and learning of mathematics. He has attended numerous seminars and workshops at the national level organized by NCERT and RIEs, and has published 20 research papers in reputed journals and national conferences. Mr. Paul's recent contribution to rolling out NISHTHA on the DIKSHA platform for primary and secondary school teachers in Puducherry has been widely recognized, and his passion for mathematics is evident in this book, which is a testament to his ideals as a teacher.