From: Enhancing language skills and student engagement: investigating the impact of Quizlet in teaching Chinese as a foreign language
HSK
Vocabulary
Common European Framework of Reference for Languages (CEFR)
Level 6
More than 5000
C2
Level 5
2500
C1
Level 4
1200
B2
Level 3
600
B1
Level 2
300
A2
Level 1
150
A1