How do I use UPSC PYQs for targeted revision in weak areas?

To use PYQs for targeted revision, move beyond solving to reverse-engineering themes.
Start by mapping questions to micro-topics; for instance, grouping all "Parliamentary Committee" questions reveals recurring patterns.
Next, perform a three-bucket error analysis: categorise mistakes as silly errors, conceptual gaps, or total knowledge gaps to prioritise your study.
Research every incorrect option, as distractors often become future questions.
For maximum clarity, follow a workflow of diagnosing weak themes, triaging by researching all options, reinforcing facts via a mistake diary, and validating your progress by re-attempting the same questions after two weeks.