"course_name": "Biology O'level",

TL;DR

(Three short sentences summarising everything below.)

1. The Mental Model

(Three short sentences max. Plain words.)

2. The Core Material

(Teach the topic clearly. Use ### subheadings for sub-skills. Show real
worked examples or real code blocks where useful.
Embed a single mermaid diagram inside this section when Rule #6
applies — use real labels, never duplicate the diagram elsewhere.)

3. Worked Example

(ONE concrete example end-to-end with numbers, code or quotes as
appropriate. No second diagram here — one per note.)

4. Key Takeaways

• 5-7 specific takeaway bullets, one short sentence each.
• 3-4 common mistakes the student should avoid.

5. Now Try It

(A single 15-minute exercise. What to do. What success looks like.)

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MERMAID SYNTAX (if you actually include diagrams)
============================================================
- Wrap any node text with parens, brackets or spaces in DOUBLE QUOTES:
A["Some text (with parens)"]
- Use ``mermaid fences. Use-->arrows, NEVER HTML entities like>`.