GS Paper IV is the only paper where the syllabus is mostly about you: how you reason, what you value, and how you would act as an officer. Half the paper is theory; the other half is case studies.

What UPSC asks

Section A (theory): ethics and human interface; attitude; aptitude and foundational values for civil service; emotional intelligence; contributions of moral thinkers; public service values and ethics in public administration; probity in governance.
Section B: case studies on the above issues.

How to use these notes

For every concept, collect a definition, an example from administration, and a thinker. For case studies, practise the same structure each time: stakeholders, ethical issues, options with merits and demerits, and the course of action you would take.