Best practices to improve the retention of geographical concepts for UPSC include utilizing visual aids like maps and charts that clarify relationships and spatial understanding. Incorporating case studies provides real-world context, making concepts relatable. Engaging in regular revision and practice tests reinforces memory recall. Interactive learning methods, such as group discussions or teaching concepts to peers, promotes deeper understanding. Lastly, connecting geographical concepts to current events helps contextualize the information, making it easier to remember and apply during the exam.