AP · IB · CEMC · CSCA · BC Bridge
Master your exam.
Lock it in.
Lectures + videos are free forever. What you pay for is the SM-2 memory-curve engine, 18,000+ practice questions, and an AI Tutor — the parts that actually move your score.
What makes it different
Three things you won't get from a textbook.
Every feature is engineered around one question: will the student remember this on exam day?
Curriculum-tight Lectures + Videos
课程笔记 · 紧贴大纲
Every section ID maps to the official outline. Worked examples from real past papers, callouts for traps, narrated audio, YouTube walkthroughs.
How we build lecturesMemory Curve Engine
记忆曲线 · SM-2 间隔重复
The SM-2 algorithm schedules each card's next review the day before you'd forget it. Email reminders Mon/Wed/Fri. AI-managed Discord group (coming).
How we beat forgettingReal Exam Practice
真题练习 · MCQ + FRQ + Mock
18,324+ MCQs and FRQs, every one with a worked solution. Diagnostic to find weak spots, mock exams for endurance.
See pricingYour AI study coach.
Built around your actual week.
AI 个人化学习计划 · 全程督导
Tell the AI your subjects, real weekly availability, and how far out your exams are. It builds a day-by-day schedule fitted to the exact weekdays you commit to — not a generic calendar. Then it stays on: checking in when you fall behind, nudging you back on track, and rebalancing the plan automatically so nothing falls through the cracks.
AI Personalized Study Plan
Included with All-Access + Tools (Premium)
- Day-by-day schedule
- Ongoing AI supervision
- Auto-rebalancing plan
- In-app + email nudges
How it works
3 steps. Same loop every day.
Pick a course
选课程
Browse 34 courses by category — AP, CEMC, CSCA, BC bridges. Take a free diagnostic to find your level.
Learn the chapter
读章节
Lecture notes + audio + worked examples. Each section ends with a Try-It quiz. 15 min focused, no rabbit holes.
Lock it in
记牢它
Practice questions go into the memory curve. You re-test only what you're about to forget. Email reminders bring you back.
By the numbers
Hand-built, exam-grade content across every course.
45
Courses
AP · IB · CEMC · CSCA · BC
363
Units
official-outline mapped
2,045
Topics
each with worked examples
18,324+
Questions
with full solutions
Browse courses
By category · click any to read free lecture notes & preview.
Mathematics
8 coursesAP Calculus AB
AP 微积分 AB
AP Calculus BC
AP 微积分 BC
CSCA Math
CSCA 数学 (留学生考中国大学)
CEMC Gauss 7
滑铁卢 Gauss 7 数学竞赛
CEMC Gauss 8
滑铁卢 Gauss 8 数学竞赛
Math Fast-Track (Grade 5 → Gauss 7)
数学直通车 · 五年级 → Gauss 7
Pre-Calculus (Grade 10–12 Bridge to AP Calculus)
Pre-Calculus (Grade 10–12 Bridge to AP Calculus)
WPGA Math 10 Final Review
西点格雷学院 10 年级数学期末复习
Science
8 coursesBiodiversity & Ecosystems — Life on Our Planet
生物多样性与生态系统 —— 我们星球上的生命
Chemistry Fast-Track (Grade 5 → Chem 11)
化学直通车 · 五年级 → 化学11
Chemistry Prep (Chem 11 Bridge)
化学预备课程（衔接 AP Chem）
AP Chemistry
AP化学
Physics 10 (BC Science 10)
BC 物理 10（科学 10）
Physics 11 (BC)
BC 物理 11
Physics 12 (BC)
BC 物理 12
Physics Fast-Track (Grade 5 → Physics 11)
物理直通车 · 五年级 → 物理11
Computer Science
1 coursesHistory & Social Science
8 coursesCanada & USA History · Grade 10 — The World Wars Era
加美历史 · 十年级 —— 两次世界大战的年代
Canada & USA History · Grade 11 — Modern Nations
加美历史 · 十一年级 —— 现代国家
Canada & USA History · Grade 12 — Government, Rights & Historical Thinking
加美历史 · 十二年级 —— 政府、权利与历史思维
Canada & USA History · Grade 5 — First Peoples & Explorers
加美历史 · 五年级 —— 最早的居民与探险者
Canada & USA History · Grade 6 — Settlers & Colonies
加美历史 · 六年级 —— 移民与殖民地
Canada & USA History · Grade 7 — Revolution & Conquest
加美历史 · 七年级 —— 革命与征服
Canada & USA History · Grade 8 — Building Nations
加美历史 · 八年级 —— 国家的建立
Canada & USA History · Grade 9 — A Country Grows
加美历史 · 九年级 —— 国家的成长
Standardized Tests
1 coursesWho it's for
AP / IB students
Sitting CollegeBoard or IB exams May 2026
Math-comp kids
Prepping CEMC Gauss / AMC 8 / Waterloo contests
International students
CSCA / 留学生考中国大学的数学
BC high schoolers
Bridge curricula for Science / Physics / Math 10-12
Start free. Upgrade if it helps.
All 34 courses are browseable on the free plan. Practice questions and the memory-curve engine are on the paid tiers — try them with a 7-day free trial.
Free
Lecture notes · 1 diagnostic / course
$8/mo
All-Access · all courses
$30 one-time
Single course · cram-period