Directions. This set contains 100 English-only questions, organized into ten units that mirror the Digital SAT Reading and Writing framework (Craft & Structure, Information & Ideas, Standard English Conventions, Expression of Ideas). Each unit gathers the question types Korean students most frequently miss due to close synonym pairs, subtle logical shifts, or grammar rules that don't map cleanly onto Korean. Select an answer to reveal the explanation immediately — there is no going back to "hide" it, so treat each choice as final, exactly as on the real exam.