Understanding Word Difficulty Levels

If level is too easy, progress feels slow. If it is too hard, completion collapses.

Difficulty fit determines whether your study loop survives for weeks.

Track completion rate, accuracy trend, and fatigue level.

A healthy level keeps all three stable over at least one week.

Move up when accuracy and completion remain stable for multiple sessions.

Move down temporarily when frustration rises and completion drops.

Recommended path is a map, not a strict rule. Personal pacing is normal.

Staying one level longer is often more efficient than forcing early promotion.

Wrong level selection increases random guessing and weakens review value.

Good level fit improves retrieval quality and strengthens spaced repetition outcomes.

Review your metrics every week and adjust only one variable: level or review ratio.

Small controlled adjustments outperform frequent drastic changes.