C
The Ceiling — Digital SAT Math Lab

Hard Practice Module

22 hand-picked questions built from the exact traps Korean SAT students fall into most often — sign errors under absolute values, extraneous rational-equation roots, discriminant conditions, and multi-step composite functions. Every answer was checked three independent ways with SymPy before it made the cut.

Questions
22
Time
35 min
Calculator
Allowed
Difficulty
Hard only

Before you start

  • Every question here sits at the difficulty ceiling of the digital SAT — this set skips easy and medium items on purpose.
  • The on-screen calculator is the Desmos graphing calculator, identical to the one in Bluebook.
  • Choose an answer to see the full explanation appear immediately — use this to study, not just to test.
  • Mark any question for review with the flag icon and jump back to it from the navigator at the bottom.
  • When you finish, print a clean, ink-light answer key from the results screen.
Timer starts the moment you begin.