Developing retention skills for crucial UPSC concepts involves employing techniques like spaced repetition and active recall. Utilizing flashcards and summarizing content helps reinforce memory, while teaching concepts to peers aids retention. Regular revision sessions ensure familiarity with topics over time. Establishing connections between new and existing knowledge enhances understanding. Employing mnemonic devices and visual aids can also help in memorizing complex information. Moreover, practicing past questions under timed conditions encourages retrieval practice, further solidifying memory. By integrating these strategies, candidates can boost their retention capabilities for the UPSC exam.