SAT Crusher
My kids needed SAT prep that actually adapts to why they get things wrong.
Adaptive SAT prep platform with 8 AI tutor modes, spaced repetition, and wrong-answer DNA analysis.
The Problem
SAT prep tools are either too generic (random questions with no adaptation) or too expensive ($50+/month). None of them truly understand why a student gets things wrong — they just track right vs. wrong.
The Solution
SAT Crusher adapts to each student’s weakness patterns. It combines adaptive testing, AI tutoring (벼락 깨달음 system), and data-driven wrong-answer analysis to create a personalized prep experience.
Key Features
- Adaptive testing — Module 1 performance (60% threshold) determines Hard or Easy Module 2
- 8 AI tutor modes — Free, 벼락 깨달음, DNA Guide, Passage Strategy, Speed Run, Analysis Run, Weakness Run, Vocabulary
- Wrong-Answer DNA — Tracks 10 trap types to build a personal weakness profile
- Spaced repetition — SM-2 algorithm for optimal review scheduling
- Bilingual — Full English/Korean i18n support
- Analytics dashboard — Recharts-powered progress visualization
- Math rendering — KaTeX for beautiful equation display
Technical Architecture
React 19 + React Router v7 for SPA routing. Supabase provides PostgreSQL with Row Level Security for the backend. Fireworks AI (deepseek-v3p1) powers the intelligent tutoring system. Zustand 5 for state management with persistent stores.
Why I Built This
My kids needed SAT prep. I wanted to build something that truly adapts — not just random questions, but a system that understands why a student gets things wrong and targets those specific weaknesses.
Screenshots
