Topic Worksheet
One focused subtopic
单个知识点专项练习。
Early-bird: US$3
Regular: US$4
Edexcel 4MA1 Pricing
Early-bird pricing available — lock in lower prices before launch.
早鸟价格现已开放，正式上线前锁定更低价格。
Pricing Note
Early-bird prices are available for a limited time. All prices are one-time purchases — no subscriptions or recurring fees.
早鸟价格限时供应，所有产品均为一次性购买，无订阅或循环扣款。
Section Bundle
All subtopics in one syllabus section
同章节多个知识点打包，覆盖更全面。
Early-bird: US$12
Regular: US$15
Unit Bundle
Foundation + Higher unit package
完整单元包，覆盖 Foundation 与 Higher 的核心能力。
Early-bird: US$20
Regular: US$25
Mega Bundle
All 6 units
全单元合集，适合完整备考周期。
Early-bird: US$79
Regular: US$99
How It Works
从单个知识点开始，按学习进度逐步升级。
Step 1: Start
Pick a topic worksheet and start practising with immediate results.
选择一个专题练习，即刻开始练习。
Step 2: Expand
Upgrade to a section bundle for broader coverage across related subtopics.
升级到章节合集，覆盖更多相关知识点。
Step 3: Complete
Get the full unit bundle with Foundation + Higher tracks and bonus materials.
获取完整单元包（含 Foundation + Higher），附赠双语词汇卡。