Hello, Here are the extra subjects you will need in every step-

For the prelims 1,

1. Current events of national and international importance.
2. Indian and World Geography
3. Economic and Social Development Sustainable Development, Poverty, Inclusion, Demographics, Social Sector initiatives, etc.
4. General issues on Environmental Ecology, Bio-diversity, and Climate Change.
5. General Science.

For prelims 2-

Basic numeracy (numbers and their relations, orders of magnitude, etc.) (Class X level), Data interpretation (charts, graphs, tables, data sufficiency etc. Class X level).

For Mains 2-

1. Salient features of Indian Society, Diversity of India.
2. Role of women and womens organization, population and associated issues, poverty and developmental issues, urbanization, their problems, and their remedies.
3. Effects of globalization on Indian society.
4. Social empowerment, communalism, regionalism & secularism.
5. Salient features of the worlds physical geography.
6. Distribution of key natural resources across the world (including South Asia and the Indian sub-continent); factors responsible for the location of primary, secondary, and tertiary sector industries in various parts of the world (including India)
7. Important Geophysical phenomena such as earthquakes, Tsunami, Volcanic activity, cyclone etc., geographical features and their location- changes in critical geographical features (including water-bodies and ice-caps) and in flora and fauna and the effects of such changes.

For mains 3-

Governance, Constitution, Polity, Social Justice and International relations.

For mains 4-

Technology, Economic Development, Bio-diversity, Environment, Security and Disaster Management.

For mains 5-

Ethics, Integrity, and Aptitude

For mains 6, you may choose any of the optional subjects, History will be the best for you.

For mains paper 7, choose any 1-

1. Asamese

2. Bengali

3. Bodo

4. Dogri

5. Gujarati

6. Hindi

7. Kannada

8. Kashmiri

9. Konkani

10. Maithili

11. Malayalam

12. Manipuri

13. Marathi

14. Nepali

15. Oriya

16. Punjabi

17. Sanskrit

18. Santhali

19. Sindhi

20. Tamil

21. Telugu

22. Urdu

23. English.

All the best!