To develop critical thinking during UPSC preparation, aspirants should engage in active learning. This involves questioning assumptions, analyzing arguments, and evaluating evidence. Solving mock tests and previous year papers helps develop reasoning skills. Reading diverse materials—like newspapers, journals, and books—encourages exposure to multiple viewpoints. Additionally, participating in debates or group discussions hones analytical abilities. Creating a habit of reflecting on questions posed in the UPSC syllabus fosters a reflective mindset, enabling aspirants to approach problems systematically. Regularly practicing writing essays also strengthens argument development and critical analysis.