I've tried countless books, but the ones with practice exercises truly stand out. 'Korean Grammar in Use' is a fantastic choice because it breaks down complex grammar points into digestible lessons, followed by exercises that reinforce what you've learned. The workbook format makes it easy to track progress, and the answer key at the back is super helpful for self-study.
Another gem is 'Integrated Korean', which is widely used in universities. It balances vocabulary, grammar, and exercises seamlessly. The listening and writing exercises are particularly effective for improving practical skills. For beginners, 'Talk To Me In Korean' workbooks are a fun yet structured way to practice. They include fill-in-the-blanks, matching exercises, and even short essays, making learning interactive and engaging. These books have been my go-to resources for mastering Korean in a systematic way.