Free SAT Study Library: Formulas, Desmos, Grammar and Worked Answers

• Printable formula reference: distinguish formulas supplied in Bluebook from useful relationships to recall.
• Student-produced responses: solve without choices and practice fractions, decimals and negative answers.
• Math formula flashcards: retrieve a relationship, then check an original example.

• Linear systems: enter two equations and interpret their intersection.
• Quadratics: distinguish zeros, vertex coordinates and the quantity asked for.
• Regression: create a table, fit a model and check predictions.
• Curve intersections: find all intersections and confirm them algebraically.
• Window settings: reveal values outside the default view and select degrees or radians.

• Comma and semicolon guide: test clause structure before choosing punctuation.
• Subject-verb agreement: find the main subject across intervening phrases.
• Grammar flashcards: recall 12 rules with original examples.
• Vocabulary in context: learn meanings through sentences rather than a claimed frequency ranking.

Watch the short original video lessons with captions and visible transcripts, then attempt a transfer problem. The worked-solution collection includes original math and Reading and Writing problems. Each page explains the main method, a second check, tempting errors and a transfer exercise. These are teaching examples, not official SAT questions or calibrated predictions of a test score. Use official Bluebook practice (opens in a new tab) for official adaptive test practice.