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Visual references, worked examples, and printable templates for the topics students actually struggle with. Free, no sign-up, and no exam answers.
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Math
Formulas, identities, and worked examples from algebra to calculus.
Science
Physics equations, chemistry formulas, and reference tables.
English & Writing
Grammar, punctuation, essay structure, and academic writing.
Languages
Scripts, conjugation tables, and pronunciation charts.
Study Skills
Note-taking systems, revision plans, and memory techniques.
Exam Prep
Board-specific formula sheets and revision references.
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Math
Derivative Rules
Every core derivative rule on one page: power, product, quotient, chain, trig, exponential, and logarithms, with worked examples.
Math
Trig Identities
Pythagorean, reciprocal, sum, double-angle and half-angle identities with exact values and worked examples.
Science
Physics Equations
Mechanics, electricity, waves and thermodynamics equations with units and worked examples.
English & Writing
English Tenses
All 12 English tenses with form, use, and examples, plus the mistakes learners make most often.
Languages
Hiragana Chart
Complete hiragana chart with basic, dakuten, handakuten, and yōon combinations, plus pronunciation notes.
Languages
Spanish Present Tense
Regular -ar, -er, -ir endings, stem-changing verbs, and the most common irregular verbs in the present tense.
Study Skills
Cornell Notes
How the Cornell note-taking system works, a printable template, and a worked example.
Exam Prep
GCSE Maths Formulas
The formulas GCSE students need most: algebra, geometry, trigonometry, and statistics, with a note on exam-board differences.
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CheatDX is a study reference. It does not publish exam questions, leaked papers, or answers for a test you are about to take. If you are looking for a shortcut through an exam, this is not that site.