How it works

• Each session serves up to 20 cards: overdue reviews first, then up to 10 new words.

• Rate each card (Again / Hard / Good / Easy) — the SM-2 algorithm schedules your next review at the optimal interval.

• A word counts as mastered once its review interval reaches 21+ days.

• Reach 80% mastery before moving to the next HSK level for the best results.