1, Japanese proficiency test N4-N5 vocabulary 4000 (Japanese proficiency test N4? N5 Vocabulary 4000): The Japanese Proficiency Test is officially published, covering the vocabulary of CET-4. This book contains 4000 commonly used words, each with examples and exercises.

2. "Practical Japanese Listening and Speaking Vocabulary" (Japanese Listening and Speaking Vocabulary): written by Japanese teaching experts, focusing on practical Japanese commonly used in daily life and work, suitable for review in CET-4.