Overview in the beginning of each chapter presents the basic structure, major topics covered and the central idea of the subject matter at hand. Must Practice section of each chapter provides ready practice through Previous Years? solved CBSE Board Problems. Questions with Incomplete Information/Missing Figures provide ability to hypothesize a constrained range of figures and/or entries for the missing items. These are incorporated in accordance with the revised examination pattern. Assess Yourself is the range of exercises at the end of each chapter. It constitutes typology of questions comprising remembering, understanding and application-based questions. A variety of MCQs has been incorporated in each chapter in accordance with the revised examination pattern. A section 'Competency Focused Questions' comprises MCQs, Assertion-Reasons and Case-based questions in each chapters. NCERT Problems with solutions are given under the section MUST NOW.