SATPrep Math Module — Hardest 20
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20 Curated Questions Bluebook-Style Interface Desmos Calculator Instant Explanations

SAT Math — Hardest Question Set

Built for students who already know the basics and want to eliminate every trap on test day.
✔ 20 hand-picked questions covering the exact error patterns Korean students miss most often
✔ Full-screen Desmos graphing calculator, identical to the real digital SAT
✔ Answer choice selected → instant correct/incorrect feedback + concise explanation
✔ Flag for Review, Question Navigator, and countdown timer — same UI as Bluebook
✔ One-click ink-saving, black-and-white PDF print version with large, unbreakable math typesetting

Reference Sheet

CircleA = πr²
C = 2πr
RectangleA = ℓw
TriangleA = ½bh
Right Trianglea² + b² = c²
CylinderV = πr²h
Cone / PyramidV = ⅓ (base)(height)
SphereV = 4/3 πr³
Special Right Triangles30-60-90 and 45-45-90 ratios apply
The number of degrees of arc in a circle is 360. The number of radians of arc in a circle is 2π. The sum of the measures in degrees of the angles of a triangle is 180.

SAT Math Practice — Hardest 20 Questions

Ink-saving print edition · Black & white · Answer key on final page

Answer Key