âHi! Korean 1A Workbookâ is a textbook that can be used together with the âHi! Korean 1A Studentâs Bookâ in class or for self-study. You can review content step by step, from replacement exercises to expanded practice, using the grammar youâve learned in the textbook. In the Self-Evaluation section at the end of each unit, answer questions about the vocabulary and grammar youâve learned to confirm your degree of understanding. Book 1A can also be used as a writing notebook in which you can improve your skills by directly writing out the vocabulary learned in the unit on Hangeul.