在没有答案的情况下做一遍Do it once with no answer in front of you
每套模拟考都换了业务场景，但考点和真实 assessment 一一对应。这是检验「你是理解了还是背下来了」最直接的办法。Each mock swaps the business scenario but keeps a one-to-one match with what the real assessment tests. It is the most direct way to find out whether you understood it or memorised it.
它们不是源项目里的内容，也不是任何真实考题。它们的作用是「换一个场景考同样的东西」。
两套模拟题的参考答案都在本机跑通过自己的测试：React 那套 5/5，Federation 那套 14/14。starter 状态下的基线实测是 5 failed / 5 total 和 10 failed / 4 passed。They are not from the source projects and not real exam questions. Their job is to test the same things in a different scenario.
Both reference answers really were run here and passed their own tests: 5/5 for React, 14/14 for Federation. From the starter, the measured baselines are 5 failed / 5 total and 10 failed / 4 passed.
- 读完全部需求和评分标准，别急着看 starter。
- 在本机新建一个目录，把 starter 和测试抄进去。
- 按建议时长计时做完。中途不要打开讲解。
- 跑测试 + 做手动自检，按 rubric 给自己打分。
- 最后才打开讲解和参考答案，对照你漏掉了什么。
- Read every requirement and the rubric first, before you look at the starter.
- Make a fresh directory on your machine and copy the starter and the tests into it.
- Work to the suggested time limit. Do not open the walkthrough on the way.
- Run the tests and do the manual checks, then score yourself against the rubric.
- Only then open the walkthrough and the answer and see what you missed.
IT 支持工单看板。可以新建工单（标题 + 优先级）、关闭工单、改派（编辑）工单，还能按优先级筛选。业务场景换了，数据结构多了一个枚举字段和一个筛选状态，但底层要你会的东西和 Notes Manager 一模一样。An IT support ticket board. You can create a ticket (title plus priority), close one, reassign (edit) one, and filter by priority. The business setting is different and the data has one extra enum field and one filter state, but what you need to know underneath is the same as in Notes Manager.
图书评论 subgraph。它既不拥有 Author 也不拥有 Book —— 两者都由 Catalog subgraph 提供，本服务只往它们身上挂 reviews 和 averageRating。Book 用的是复合 key（isbn + edition），这是真实项目里很常见、但比单字段 key 更容易写错的情况。A book reviews subgraph. It owns neither Author nor Book — both come from the Catalog subgraph, and this service only attaches reviews and averageRating to them. Book uses a composite key (isbn plus edition), which is common in real projects and easier to get wrong than a single-field key.