https://www.khanacademy.org/test-prep/sat-reading-and-writing/x0d47bcec73eb6c4b:challenge-all-reading-and-writing-domains 2026-07-02T20:40:42.32480257Z Challenge: Highest-difficulty practice This unit covers the most difficult questions of each skill type on the test. If you’ve mastered the advanced-difficulty questions, these challenge-level exercises are your final step toward a perfect score. unit