A free, fully interactive, browser-based test preparation platform designed specifically to train students in using Desmos as a regression and solver machine for the Digital SAT. Rather than treating Desmos as a simple graphing calculator, this environment teaches advanced regression techniques that can crack difficult SAT systems, percentages, circles, and quadratics in seconds.
- GitHub Pages (Primary Live Build): https://anonyoumss.github.io/SatDesmosRegressionTrainer/
- Replit Development Sandbox: https://sat-desmos-regression-trainer--devhackerg.replit.app/
This tool represents the culmination of multiple community iterations aimed at expanding Digital SAT prep access:
- The Foundation (Sceptrell): The original concept was built by Sceptrell to provide procedural question generation alongside a basic Desmos layout.
- The Evolution (fifaaworldcup): Upgraded by fifaaworldcup to add additional question banks, refined logic, and structural fixes.
- The Nebula Edition (Anonyoumss): Built out into a full Bluebook-compliant simulation platform featuring pacing engines, comprehensive analytics, adjustable panels, reference sheets, and strategy injection directly into the calculator API.
- Goal-Oriented Spacing: Every question type features a customized Perfect Time target (e.g., 60 seconds for easy questions, up to 120 seconds for hard limits).
- Visual Pacing Bar: A high-contrast pacing bar at the top of the interface fills up in real time. It turns neon red and glows once you cross the target time, reinforcing the exam pacing instinct.
- Hard Mode Scaler: Toggle Hard Mode to automatically scale target time constraints down to 80% of original levels and hide hints/solved example assets.
- Resizable 2-Column Split: Designed using CSS Grid, users can drag the vertical partition divider to adjust layout widths. Partition sizing is persisted across reloads via
localStorage. - Detachable Floating Window: Hit the Detach button on the Desmos toolbar to pop the calculator out into a centered, overlay frame (
80vwx80vh), allowing focus mode on complex equations.
- Collapsible Reference Drawer: Pulls live text from reference.md and converts it to formatted layout cards via
marked.js. - LaTeX Renderings: Renders complex mathematical formulas inside strategy sheets using MathJax v3.
- Direct Script Injection: Click on any highlighted strategy expression in the reference sheet to dynamically inject it into the active Desmos workspace (e.g., automatically inserting a regression structure
y1 ~ ax1^2 + bx1 + c).
- Dynamic Grid: Displays your progress across all 15 test categories.
- Color-Coded Mastery Bands:
- 🟢 Master (Green): High accuracy and fast solve times.
- 🔵 Pro (Blue): Highly accurate but slower than the Perfect Time target.
- 🟡 Intermediate (Yellow): Needs practice to build consistency.
- 🔴 Beginner (Red): Struggling with correctness/accuracy in this category.
- F-Key Flagging: Mark challenging questions for review.
- Offline Study Packs: Export flagged questions client-side to generate a printable HTML/CSS formatted document complete with formula guidelines and problem sheets.
- Simulated Exams: Initiate a mock test using the navigation action.
- Automated Feedback: Generates an official report card grading accuracy and speed, diagnosing weakest categories, and providing action-oriented feedback.
- Cross-Out Mode (C): Toggle annotations and click words inside question paragraphs to cross them out.
- Click-to-Copy Numbers: Standalone constants are rendered with dotted underlines. Click them to copy raw value numbers directly to your clipboard (safely skipping LaTeX brackets).
| Difficulty | Category | Target Pace (Pacing Engine) |
|---|---|---|
| Easy | Linear Properties from Two Points | 60 seconds |
| Easy | Trigonometric Identity Evaluation | 60 seconds |
| Easy | Simple Percentage Change | 60 seconds |
| Medium | Two Points Non-Linear | 90 seconds |
| Medium | Circle Regression | 90 seconds |
| Medium | Equivalent Expression Constants | 90 seconds |
| Medium | Exponential Coefficients | 90 seconds |
| Medium | Complex Percentage Relationships | 90 seconds |
| Medium | Quadratic System of Equations | 90 seconds |
| Medium | Parabola Symmetry (Vertex & Intercepts) | 90 seconds |
| Medium | Radius of Non-Standard Circle | 90 seconds |
| Medium | Trinomial Factoring | 90 seconds |
| Hard | Factoring a Quartic Function | 120 seconds |
| Hard | Quadratic and Linear Intersection | 120 seconds |
| Hard | Quadratic Regression Limit | 120 seconds |
| Shortcut | Action |
|---|---|
Enter |
Check inputted answer |
Shift + Enter |
Check & auto-load next question (if correct) |
Alt + Enter |
Start / Stop Timed Test mode |
Ctrl + D |
Toggle Dark / Light Theme |
F |
Flag current question for review |
C |
Toggle annotation cross-out mode |
H |
Open / Close Searchable Cheat Sheet |
1 - 4 |
Select multiple choice options |
Esc |
Close modals and active drawers |
We welcome contributions from math instructors, educators, and developers! Here is how you can help:
To add a question category:
- Open questions.js.
- Append a new category object to the
categoriesarray. Ensure you provide:- Unique
idandtitle. difficulty('easy','medium', or'hard').perfectTime(in seconds).questionGeneratorfunction returning{ questionText: "...", answer: value }.
- Unique
- Adjust stylesheet rules inside style.css.
- Make sure to respect the responsive grid configuration (keeping phone/mobile layouts in sync).
You can run a local test server using python or node:
# Python 3
python3 -m http.server 8000
# Node/Static Server
npx http-serverRun our headless testing suite to verify script execution:
npm install
node test_local.js (located in scratch directory)- Core: Vanilla ECMAScript, HTML5, CSS3 Custom Properties.
- Embedded Calc: Desmos API v1.11.
- LaTeX Math Engine: MathJax v3.
- Markdown Compiler: marked.js.
- Sound Synth: Web Audio API (real-time sound generation).
- Original author: Sceptrell
- Evolution codebase: fifaaworldcup
- Current platform: Anonyoumss
- Special thanks to AdiarMath, LearnSATMath, and student feedback loops.