The book has been divided into the following four sections: section 1 - descriptive study material along with short-answer questions & Points for revision section 2 - Objective multiple choice questions section 3 - reference charts section 4 - Model test papers in a book covering such a vast ground, selective approach, along with compression of study material, had to be adopted. 'Descriptive study material' Gives a comprehensive overview of all aspects of the entire subject. 'Short Answer questions; help the reader understand the shades and hues. 'Points for revision' Help to rapidly revise and grasp the entire subject. 'Objective multiple choice questions' Test and train for the upward and onward journey en route to success. In the 'model test papers', questions have either been incorporated from previous years' Papers of Central Civil Services Examination, state Civil Services Examinations, UGC NET/SLET and other higher grade competitive examinations or have been framed on the same pattern. Answers to all the questions have been provided. This book has been prepared under My supervision.