The Lecture System
Free ForeverBetter lectures.
Higher scores.
Every chapter is built tight to the curriculum, narrated in Chinese + English, paired with YouTube walkthroughs, and stress-tested against real past papers. No fluff, no filler.
Designed for retention, not entertainment
We threw out the “long video lecture → do problems alone” loop and built something tighter.
Curriculum-aligned
Every section ID (e.g. 1.1, 4.7) maps exactly to the CollegeBoard / CEMC / CSCA outline. No off-topic detours.
Worked from real exams
Every chapter cites at least one question from a recent past paper, worked step-by-step with the trap explained.
Practice embedded
"Try it!" mini-quiz at the end of every section. Answer reveals are collapsed by default so you actually attempt them.
Narrated + on video
Chinese / EN narrated audio for each subsection. Curated YouTube videos by other creators for tricky topics — always free, always attributed.
Anatomy of a chapter
Every chapter has the same skeleton
You should never have to figure out the page layout. After 1 chapter, you know exactly where to find every component on every chapter, across every subject.
- 🎯Learning Goals callout — What you can do after the chapter
- 📚Theory section — Definitions, intuition, formula sheets
- 🔑Key Insight callouts — The trap / shortcut / mnemonic
- ✏️Worked Example — Step-by-step solution to a past-paper item
- 📝"Try it!" exercises — Mini quiz, answers in collapsed details tag
- 📌Chapter Summary — Skim before exam, no need to re-read everything
Chapter 1
Sets & Inequalities
## 1.1 Set Operations
A set is a collection of distinct objects…
### Worked Example 1.1.A
YouTube walkthroughs
For tricky topics we curate 5–7 minute YouTube walkthroughs from the best free creatorsand embed them inline. Always with clear attribution; clicking the title takes you to the creator's channel. 100% free, even without an account.
📺 Videos credited to their original creators · embedded via YouTube's official iframe with attribution ·see attribution policy
Lecture audio (中 / EN)
Every section has a narrated audio companion — useful for review during commutes, runs, or while drawing diagrams. Chinese for ESL students, English for native speakers.
1.1 Set Operations · 中文
Now live for calculus-bc, gauss-7. Other courses gradually.
Outline fidelity
Every minute is on the exam.
Most prep videos drift into “here's a fun related thing” tangents. Our chapters refuse to. Each section header includes the official topic ID, so you can audit fit against the curriculum sheet in 5 seconds.
CSCA Math · Unit 1 (8% of exam)
100% of past paper questions in this unit map to one of these 5 topic IDs.
Built across all our courses
The lecture system isn't a one-off — it's the engine running every subject.
45
Courses
AP · IB · CEMC · CSCA · BC bridge
363
Units
mapped to official outlines
2,045
Topics
every one drilled
18,324+
Questions
with worked solutions
Video Attribution Policy
We respect creators. Videos are free and attributed.
- All embedded videos are via YouTube's official iframe — playback, ads, and metrics go through YouTube to the original creator.
- Every embed shows the creator's name; clicking the title opens the video on the creator's YouTube channel.
- Videos are not behind any paywall — anyone, signed-in or not, can watch.
- What Borui Academy charges for is the surrounding system — Memory Curve, practice questions, mock exams, AI Tutor — not the videos themselves.
- Creators who don't want their videos embedded can email [email protected] and we'll remove the embed within 24 h.