10 books
GMAT Official Guide Data Insights Review 2023–2024 : Book + Online Question Bank (Chinese Version)
GMAT Official Guide Verbal Review 2022: Book + Onl ine Question Bank, (Chinese Version) 2ed
The Official Guide for GMAT Quantitative Review 2016 with Online Question Bank and Exclusive Video
The Official Guide for GMAT Verbal Review 2016 with Online Question Bank and Exclusive Video