Curated for students who already score well but still lose points on the traps that separate 750 from 800. Every item below targets a specific, recurring error pattern seen in Korean students' practice data — precise word-choice nuance, causal-vs-correlational reasoning, parallel structure, and boundary punctuation. Answer any question to reveal a full explanation and the exact trap it's designed to catch. Scroll to work through all 100, or jump to a unit below.