PYQs alone are not enough to complete preparation, but they are one of the best tools to understand the exam. They show what UPSC actually asks, the depth of questions, and how different syllabus topics are tested.

When you study PYQs alongside the syllabus and basic sources, they help you avoid unnecessary material and focus on important areas. Over time, PYQs build exam awareness and improve decision-making during preparation.
So PYQs may not replace studying, but they shape how you study for UPSC.