Techniques such as spaced repetition, active recall, and mnemonics can improve memory retention for the vast UPSC syllabus. Spaced repetition involves revisiting information at increasing intervals, enhancing long-term retention. Active recall encourages learners to test their memory actively, reinforcing knowledge through retrieval practice. Mnemonics aid in remembering complex information through associations or acronyms. Additionally, using visual aids and engaging in group discussions can further solidify learning. Incorporating these techniques into daily studies can lead to greater comprehension and recall during exams.