US test preparation

Speed up your SAT Math without relying on a calculator

Master core mental algebra and arithmetic to solve Digital SAT Math items faster and verify answers with confidence.

Why calculator-free fluency matters

While Desmos is embedded in the Digital SAT, reaching for a calculator for simple fraction reductions, linear slope intercepts, or basic arithmetic wastes 10–15 seconds per question. Mental fluency frees up working time for more complex items.

Start your Sharpen

Personalised daily practice that makes calculator-free maths accurate, fast and secure: a goal diagnostic, a Daily Sharpen chosen for you each day, worked lessons and correction, and weekly evidence that improvement is being retained.

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$39.99 /year

Equivalent to $3.33 a month

Monthly

$4.99 /month

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Not ready to subscribe?Try the free 7-session taster— email only, no card, once per learner.

Official facts verified via the College Board SAT portal. Last verified: August 2026.