Directions

• This module contains only high-difficulty questions — the exact question types Korean students most often miss on the digital SAT: extraneous roots, infinite/no-solution systems, exponential word problems, conditional probability, and more.
• For each question, select the best answer from choices A–D. As soon as you choose an answer, you will see whether it is correct and receive a full worked explanation — use this to learn, not just to score.
• A built-in graphing calculator (Desmos) and the official SAT reference sheet are available from the toolbar at all times, exactly as on the real exam.
• Use Mark for Review to flag questions and revisit them using the question navigator before finishing.
• When you are done, you can print a clean, ink-saving black & white version of the full test with an answer key for offline review.