History:
1. "Themes in Indian History - Part I, II, and III" by NCERT: This book is recommended for the History subject as it covers all the essential topics and themes in a comprehensive manner. It provides a clear understanding of the historical events, movements, and developments in India.

2. "India's Struggle for Independence" by Bipan Chandra: This book is highly recommended for gaining in-depth knowledge about India's freedom struggle. It covers various aspects of the independence movement, including political, social, and economic factors.

3. "Modern India" by Spectrum Publications: This book is a good supplementary resource for Class 12 students. It provides a detailed analysis of modern Indian history, including the post-independence period.

Sociology:
1. "Introducing Sociology" by Haralambos and Holborn: This book is widely used in schools and colleges for Sociology studies. It covers all the fundamental concepts, theories, and methodologies of sociology, making it an ideal choice for Class 12 students.

2. "Understanding Society" by NCERT: This textbook is prescribed by the NIOS board and provides a holistic understanding of various sociological perspectives. It covers topics like social structure, social change, and social problems in a comprehensive manner.

3. "Indian Society: Structure and Change" by Ram Ahuja: This book is highly recommended for gaining insights into Indian society. It covers a wide range of topics, including caste system, gender issues, inequality, and social change.

Political Science:
1. "Political Theory" by Rajeev Bhargava and Ashok Acharya: This book is recommended for studying the political theory and concepts in Class 12. It covers topics like democracy, power, rights, and citizenship in a comprehensive manner.

2. "Contemporary World Politics" by NCERT: This textbook is prescribed by the NIOS board and covers various aspects of international politics. It provides an understanding of global issues, foreign policies, and international organizations.

3. "Indian Constitution at Work" by NCERT: This book is essential for studying the Indian Constitution and its working. It covers topics like fundamental rights, directive principles, and political institutions in detail.

Overall, these books provide a comprehensive coverage of the respective subjects and are highly recommended for Class 12 students preparing for the NIOS board exams. It is important to refer to these books along with the prescribed curriculum and NCERT textbooks to ensure thorough preparation.

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