Each block runs a fixed number of minutes. The listed level is the target — if a hard level runs long, carry the rest to tomorrow. Understanding beats finishing.每个学习块时长固定。所列关卡是目标——若某个难关耗时较长，把剩余部分留到明天。理解比做完更重要。
Levels marked Review are familiar from IM2, so move briskly; Core and Challenge levels are new — slow down and think.标注“复习”的关卡来自 IM2、应快速通过；“核心”与“挑战”是新内容——请放慢、深入思考。
Mixing four domains each day and revisiting topics across weeks builds far stronger long-term memory than cramming one subject.每天混合四个领域、并在数周中反复回顾，比集中攻一科能形成强得多的长期记忆。
40-55 minutes of deep focus, then a genuine 10-minute break (move, hydrate, no phone). This matches teen attention spans.40-55 分钟深度专注，然后真正休息 10 分钟（活动、喝水、不玩手机）。这符合青少年的注意力规律。
New math goes in the first block while the mind is freshest; lighter, higher-interest work comes later.把新数学放在头一个块、趁头脑最清醒；较轻松、趣味性更高的内容放在后面。
A 5-minute end-of-day log and a Friday weekly review turn passive exposure into durable understanding.每天结束写 5 分钟记录、周五做每周回顾，把被动接触变成牢固理解。
Puzzles, AI, data, and physics keep motivation high. Curiosity is the engine; coverage is just the exhaust.谜题、AI、数据与物理保持高动力。好奇心是引擎，进度只是尾气。
Sleep, breakfast, water, and a little movement before 9:00 protect the morning brain. Tick each block; missing a day is fine — just resume.睡眠、早餐、喝水以及 9:00 前的少量运动保护“晨间大脑”。勾掉每个块；漏一天也没关系——继续即可。