Sogang's hallmark is "task-based learning." The textbook will present a task: "Debate the pros and cons of remote work." If you are self-studying without a partner, record yourself speaking for 2 minutes. Play it back. You will hear pronunciation errors and awkward phrasing immediately.
If you cannot find a legal PDF or the price is too high, consider these alternatives that cover the same level (Advanced Mid): sogang korean 5a pdf
If you’d like, I can draft a short sample lesson or produce practice exercises (listening prompts, grammar drills, or a model essay) based on Sogang Korean 5A content. Sogang's hallmark is "task-based learning
The writing tasks in 5A are designed to prepare students for the TOPIK II Writing section. sogang korean 5a pdf