âHi! Korean 3B Workbook\" is a textbook that can be used together with the âHi! Korean 3B Studentâs Bookâ in class or for self-study. You can review content step by step, from replacement exercises to expanded practice, using the grammar you learn in the textbook. At the intermediate level, expanded practice exercises are provided to review vocabulary and expressions studied in the Studentâs Book, with extended exercises also included in the areas of speaking, listening, and reading. Additionally, writing exercises are provided at the end of each unit so that you can practice for the writing section of the TOPIK exam by writing passages on given topics.