Google Gemini for Teachers: Three Layers Sharing One Name, Gemini in Classroom, and the Licence Bill

It is Wednesday lunchtime in the second week of term and a Secondary 5 economics teacher carries her laptop over. "I followed the tutorial step by step," she says, "and that Gemini panel on the right of Google Docs just isn't there." She had done every step correctly. What was missing was not a click but a licence at US$20 per user per month, and that year the school had only registered Education Fundamentals.

The free layer of Gemini is genuinely useful to teachers. The part that goes wrong is procurement, because "Gemini is free" and "Gemini in Docs is free" are two different sentences.

Three layers, one name

The first layer is the Gemini app at gemini.google.com. Google states it is included in every Google Workspace for Education edition at no extra cost, and Education Fundamentals is itself free to qualifying institutions. Even a school whose main productivity suite is not Google can register Fundamentals and enable this one app.

The second is Gemini in Classroom: more than thirty teaching tools living inside Google Classroom, also included in every Workspace for Education edition. Since 10 August 2026, where the administrator has granted access, students of all ages across K-12 and higher education see a Gemini tab in Classroom and can turn class materials into flashcards and practice quizzes. This is the layer hardest for a general tool to replace, precisely because it sits inside Classroom rather than next to it.

The third layer is the one you pay for, Gemini in Workspace — the sidebar in Docs, Gmail, Slides and Sheets, along with higher model and usage limits. It requires the Google AI Pro for Education add-on and is restricted to users aged 18 and over.

One name covering all three is the root of most procurement mistakes. The second layer has a boundary of its own too: Google states that generating feedback on written assignments requires Education Plus or the Teaching and Learning add-on, so Fundamentals alone will not surface it. Education Plus lists at US$6.00 per user per year.

The risk in buying Gemini is not that it underperforms. It is that three products share one name, and a procurement paper usually mentions only the name.

The differentiated worksheet

Confirm what is switched on

Before touching anything, ask the IT coordinator to check two settings in the Admin console: whether the Gemini app is enabled for the staff organisational unit, and whether the school holds any AI Pro for Education licences. Without the add-on, stop waiting for a sidebar in Docs — work in the Gemini app and export to Docs at the end. Sign in with the school account; a personal Gmail is not covered by the Workspace for Education terms.

Make difficulty checkable

The model's most common failure is writing the challenge version longer rather than harder. So do not ask for "three difficulty levels" and leave it there; state the ability each level is testing.

You teach Secondary 3 Chinese in a Hong Kong secondary school. Below is an expository passage. I need three versions of a reading comprehension worksheet, six questions each.
Foundation: direct retrieval from the text, vocabulary gap fill.
Standard: add short answers on summarising the main idea and inferring word meaning.
Challenge: add extended answers analysing the argumentation and evaluating the writer's stance.
Note the assessment focus in brackets after each question. Add a teacher version with a model answer and two to three sentences of marking points per question.
Write everything in Traditional Chinese, Hong Kong usage. No Taiwan or mainland terminology, no simplified characters. Keep the original wording when quoting.
If you are unsure how a term is handled in the Hong Kong curriculum, write "teacher to verify" instead of inventing it.
Passage: [paste the text]

Then check three things. Does the challenge version actually require judgement rather than transcription? Has any non-Hong Kong phrasing crept in? Do the model answers stay anchored to the passage? None of this is skippable, because the model writes right and wrong answers in exactly the same confident register.

When distributing, create three assignments in Classroom and use Assign to so each pupil receives only their version. Differentiation is about fit, not about letting the room see who got which sheet.

Ceilings on the free layer

The core service does not cut out, but there are walls: up to 25 Pro-model prompts every four hours, up to 300 Thinking-model prompts a day for users 18 and over, and five Deep Research reports a month. In a term when a panel is running project work, those five go in the first week.

The limit that shapes daily use is context: 32,000 tokens on the core service against 1 million with AI Pro for Education. In practice a full scheme of work plus a textbook unit will not fit, so working on the free layer means feeding it one lesson at a time.

On data handling, Google states that with a school account chats and uploaded files are not human reviewed and are not used to improve generative AI models, and that the service supports COPPA and FERPA compliance needs. Cleaner than most consumer tools, but check the current Terms of Service yourself rather than quoting an article as if it were the contract.

The bill for a hundred licences

Annual commitment against monthly

The add-on is US$20 per user per month on a one-year commitment and US$24 billed monthly. A hundred staff on the annual commitment is US$2,000 a month and US$24,000 a year, roughly HK$187,000 at 7.8 to the US dollar. Monthly billing for the same headcount costs US$4,800 more a year, and what that buys is the option to stop mid-year.

There is also a discounted rate of US$15 per user per month, but it needs two conditions at once: being an existing Education Plus customer, and buying 50 to 999 licences on a one-year commitment, with 1,000 or more negotiated separately. A Fundamentals-only school will not see that price.

None of it covers students

The sentence to put in the paper: that US$24,000 includes no student seats at all, because the add-on is restricted to users 18 and over.

You can buy a single licence, so a handful of teachers can be equipped. But planning is collaborative, and when one colleague in a shared document has the sidebar and another does not, the workflow degrades into whoever holds the licence fixing the formatting. Buy by panel rather than by individual.

If the school has to account for spending under the EDB funding scheme, capped at HK$500,000 per school, a per-seat monthly licence shows up as a line that moves with staffing changes and needs a footnote explaining why students are not covered.

Age eighteen and oversight

The age line is hard: the core service can be opened to all ages, the paid layer is 18-plus. For Hong Kong schools that means the student side of primary and junior secondary stops at the core service.

And the core service's safety operates at the level of content policy — stricter filtering, a youth onboarding flow, an automatic check against Google Search the first time a user asks a factual question. Useful, but not the same as school rules. The granularity a school actually needs looks like this: for Secondary 3 Mathematics the tutor gives at most three levels of hint, never the final answer, and declines off-curriculum topics. See student AI safety gating and the scaffolding tutor.

Oversight deserves the same clarity. Admin reports answer how many people used it and how much, and Vault can search and export domain conversations for compliance. But a panel head is asking which concept the class keeps probing and whether a student pasted in an entire assignment, which needs a system holding the curriculum context — see the school knowledge base.

On language, the official supported-language list includes Chinese (Traditional) and Chinese (Hong Kong), so interface and replies both work. Cantonese is not a selectable interface language, so treat spoken Cantonese as untested rather than writing it into a school plan.

Common misreadings

• The claim: Gemini is free for education, so the whole thing is free. What actually happens: free covers the Gemini app, Gemini Notebook and Gemini in Classroom. The sidebar in Docs and Gmail is a separate add-on from US$20 per user per month. The distance between those two sentences is about HK$187,000 a year for a hundred-staff school.
• The claim: the education edition runs Google's newest and strongest model. What actually happens: the cadences are not synchronised. Gemini 3.8 Flash, released on 2 September 2026, is the developer API workhorse, while the official education page still cited Gemini 2.5 Pro and LearnLM at the time of writing. Procurement papers should say "whichever model the education page specifies at the time".
• The claim: having the Admin console means having teacher monitoring. What actually happens: the console shows usage statistics and Vault performs compliance search and export. Neither tells a class teacher whether a student pasted a whole composition question in last night looking for the answer.

Three things to try on Monday

1. Ask the IT coordinator two questions: is the Gemini app on for the staff organisational unit, and how many AI Pro for Education licences does the school hold. Those answers decide whether the next tutorial you watch applies to you at all.
2. Take the lesson you are actually teaching next week, build the three-level worksheet in the Gemini app, and check only the challenge version — does it demand judgement, or are the sentences just longer?
3. Open the student side of Gemini in Classroom, generate flashcards and a practice quiz from material you have already uploaded, and work through them yourself. Doing it before the class does is the cheapest quality control available.