Analysing Mains PYQs topic-wise means studying questions syllabus-first, not year-first. Instead of solving one paper at a time, collect all questions from the last 10–15 years under one topic like federalism, agriculture, or internal security. This gives you a clear picture of how UPSC frames questions from that area.

Next, identify recurring themes and angles. Ask yourself: What dimensions are repeatedly asked? Is UPSC focusing more on governance, reforms, challenges, or case studies in this topic? Patterns will start appearing once you see 8–10 questions together.
Then break down each question into three parts: directive (discuss, analyse, evaluate), core issue, and expected dimensions. This helps you understand depth. You’ll realize that many questions test similar frameworks with slight variations.
Finally, create micro-notes based on those themes. Build ready frameworks and examples aligned to PYQ trends. When you analyse Mains PYQs topic-wise like this, your preparation becomes focused, structured, and exam-oriented instead of random reading.