I teach in a K-12 school and my classes are mostly science and STEM. . My math role is informal – tutoring & remediation. My secondary students will come with specific topics that they are stuck on, or behind with. Primary students come for a game or puzzle. My question – does anyone have a great system for organising resources for rapid retrieval by topic/level . I often carry a “toolbox” with regular playing cards for warm- ups and various math games, sometimes Pentominoes, math card games, and whiteboards.