Aspirants can effectively assess their understanding of subjects for UPSC by employing various assessment methods. Regular self-quizzes and mock tests help gauge knowledge retention and application skills. Participating in group study sessions encourages discussion, allowing candidates to articulate their understanding, identify gaps, and receive feedback from peers. Additionally, reflective practices such as journaling can help candidates analyze their strengths and weaknesses in different topics. This self-evaluation fosters a proactive approach to learning, enabling candidates to adjust their revision strategies based on their assessed understanding of various subjects.