The Lock In blog

Short, practical guides to the Digital SAT. The tricks that save time, the traps the test counts on, and how to plan your prep.

Math · 6 min read

7 Desmos tricks for the Digital SAT (with exactly what to type)

The Digital SAT has Desmos built in for the whole math section. Here are seven tricks that turn slow algebra into a few seconds of typing, and when not to bother.

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Reading & Writing · 5 min read

The SAT grammar trap almost everyone falls for: subject-verb agreement

Long phrases between the subject and the verb are there to trick you. Cross them out and these questions get easy. Rules, examples and practice.

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Planning · 4 min read

SAT test dates for 2026-27, and how to pick yours

Every remaining SAT weekend date for the 2026-27 school year with its registration deadline, plus how to choose a date and plan your prep.

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Planning · 5 min read

How the Digital SAT is scored (and what counts as a good score)

How the 400 to 1600 scale works, why the test adapts to you, why you should never leave a question blank, and roughly where common scores land.

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Math · 4 min read

Up 20%, then down 20%: why it's not back to where you started

A favorite SAT trap. Why a 20% raise followed by a 20% cut leaves you 4% lower, the one-line method that always works, and practice questions.

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