DIGITAL SAT · MATH
Hardest-Only Practice Module

Before you begin

This mockup mirrors the digital SAT (Bluebook) testing interface: an on-screen graphing calculator is available for every question, you may mark questions for review, and you may cross out answer choices you've eliminated.

  • Every question here was chosen because it targets a specific trap Korean SAT students most often fall into — sign errors, extraneous roots, unit/percent mistakes, and hidden domain restrictions.
  • 2 modules · 10 questions each · 15 minutes per module
  • A graphing calculator (Desmos) is built in — click the Calculator button any time
  • Full explanations are shown for every question once you finish both modules

If this is genuinely difficult for you right now, that's the point — master these and the rest of the test feels easy.

Graphing Calculator

Reference

Circle
A = πr²
C = 2πr
Rectangle
A = ℓw
Triangle
A = ½bh
Right triangle
a² + b² = c²
Special: 30-60-90, 45-45-90
Circle (radians)
2π radians = 360°
arc = r·θ
Sphere
V = 4/3 πr³
Cylinder
V = πr²h
Cone
V = 1/3 πr²h
Rectangular solid
V = ℓwh
The sum of the measures of the angles of a triangle is 180°. Number of degrees of arc in a circle is 360. Number of radians of arc in a circle is 2π.