How to Use Gemini Gems to Study: One Gem Per Class

To use Gemini Gems to study, make one Gem per class, write instructions telling Gemini how to handle that subject, and add the course material under Knowledge. Every new chat you start with that Gem applies those instructions and reads those files, so the setup you do once carries through the whole term.

Google also ships a premade Gem aimed at learners, so there is a version of this you can use in about ten seconds with no setup at all. Both paths are covered below, along with what Google actually publishes about the limits and the one thing a Gem quietly forgets.

Three Gemini features people mix up

Gems get confused with two neighbours, and the distinction is mechanical.

• A Gem is a saved instruction set, optionally with your own files attached, that you reopen and chat with. It persists.
• Guided Learning is a tutoring mode you switch on inside an ordinary chat, each time you want it. The guide to Gemini Guided Learning covers where the toggle lives and which restrictions apply to it.
• Gemini Notebook is a separate product, the renamed NotebookLM, built around answering only from sources you add. What that rename did and did not change is laid out in the student explainer on Gemini Notebook.

None of them replaces knowing how to prompt Gemini in the first place, which the general Gemini study playbook handles. This page is about the persistence layer.

What is a Gem, and how does it differ from an ordinary prompt?

Google defines it in one line. The Gemini Apps help guide Get started with Gems in Gemini Apps says “Gems are customized versions of Gemini that help you tackle repetitive tasks or get deep expertise in new areas”, and that “when you chat with a Gem, Gemini will tailor responses to save time on repeat goals and guidelines in your Gemini web app and Gemini mobile app prompts”.

The companion article How to use Gems puts the mechanism plainly: “With Gems, you can create specific and repeatable instructions for Gemini to follow.” It adds that “the Gem is a shortcut every time you want to explore a topic with similar instructions”, and that “you can create different Gems for your unique needs and reuse them to simplify your prompts and questions in Gemini Apps”.

That word reuse is the whole difference from a good prompt. A long, carefully written study prompt works once, and the job of retyping it, or hunting back through a month of chats for it, is what stops anyone using it twice. A starred chat is only a record of one exchange. A Gem is a standing brief the model reads before it answers, and you open a fresh conversation against it whenever you like. If that shape seems familiar, it is the one behind running a Claude Project per class, which has its own rules about what travels between chats.

Start with the premade Learning coach Gem

Gemini ships with Gems already built. The help article Get a quick start with premade Gems opens with “Gemini Apps comes with premade Gems to get started right away or customize for your needs”, and says they cover “a range of topics, from brainstorming and coding to career coaching”. On a computer you find them at gemini.google.com under Gems, in a section headed “Premade by Google”. On a phone the same list sits under Settings and help, then Gem manager, then By Google.

One of them is aimed squarely at students. Google introduced the Learning coach Gem in a post of August 29, 2024, 5 ways Gemini can help students study smarter, describing a premade Gem that builds a learning plan shaped to what you need, with progress check-ins along the way. The example prompt it gives is exactly how a student would open it: “I want to prep for my bio midterm. Can you help me review cells, genetics, ecology and ecosystems?” What comes back covers the key subtopics, lays out the essential concepts inside each one, and leaves room to adjust the plan or start studying immediately.

That post is from 2024, so check it against the live documentation. Two things there are worth knowing. The Learning coach Gem is still current: the Gemini Apps help article Use Gems in Gemini Apps carries a live note reading “the Learning coach premade Gem doesn’t currently support language learning”, which names it and tells you the one subject to point somewhere else. And the 2024 post said Gems were for Gemini Advanced subscribers, which the current documentation has since overtaken.

A premade Gem can also be a starting point. The quick-start article documents a Make a copy control in the web app, so you can copy one, rename it after your course, and edit its instructions. Google adds a caveat: not all premade Gems can be customized, and the article says that where the Make a copy option is absent, that Gem cannot be copied or customized at all.

How do you build your own Gem for one class?

Creation happens in one place. The help article Tips for creating custom Gems lists the Gemini web app as the only surface where custom Gems can be made, and the mobile version of the Use Gems article says the same: “You can only create, edit, or delete custom Gems in the Gemini web app. You can use Gems in the Gemini web and mobile apps.” So build it on a laptop. Google confirms it travels: “When you create a Gem in the Gemini web app, it will appear in the Gemini mobile app and the Gemini side panel in Google Workspace.”

The steps are Open Sidebar, then Gems, then New Gem, then a name and a block of instructions, then Save. Google is specific about what belongs in that block: “Provide details about your goals, desired behaviors, and preferred format to help the Gem personalize Gemini’s responses.” It offers four areas to write against, with the note that “you don’t need to use all four, but using a few will help”.

• Persona. Google says to “tell your Gem what role to play and how to respond”. For a course, that is a demanding tutor in your subject who checks your reasoning rather than praising it.
• Task. “Tell the Gem what you want Gemini to do or create.” Quizzing, explaining, and marking a written answer are three different tasks, so name the ones you want.
• Context. “Provide as much background as possible.” This is where the course code, the exam board, the level, and the topics you already struggle with go.
• Format. “Be specific when specifying desired structure.” One question at a time, a verdict before the explanation, the textbook vocabulary rather than a friendlier synonym.

Something along these lines covers a single course:

You are my tutor for second-year organic chemistry. Work from the files under Knowledge ahead of anything else, and flag it out loud whenever they do not cover what I asked. Attribute every mechanism you describe to the lecture or chapter it came from. Stick to the vocabulary my textbook uses, even where a plainer word exists. If I ask you to test me, put one question to me at a time, hold your verdict until I have committed to an answer, and lead the feedback with whatever I got wrong.

If writing that feels like work, Google built a shortcut into the editor. The tips article says that after a sentence or two you can click Use Gemini to re-write instructions and it will expand them for you. Review what it produces, because it will happily add behaviour you did not ask for.

Then the material. Under a heading called Knowledge you can add files, which Google describes as a way “to give your Gem more context or to reference specific docs in your chats with the Gem”. Three details matter for coursework. Files can come from your device, from Google Drive, or from a NotebookLM notebook. A Drive file stays live: “If you add a file from your Drive, Gemini will use the most recent version of the file. If you make changes to the file, these changes will be reflected in your Gem.” And there is a Disable knowledge citations option, which you should leave off, because a citation back to your own upload is how you check an answer in ten seconds.

That Drive behaviour is the best reason to keep lecture notes in a Google Doc: attach it once in September, keep typing into it after every lecture, and the Gem reads the current version on its own.

What a Gem carries into every new chat, and what it drops

Two things travel. The instructions apply to whatever you type, which is what Google means by repeatable instructions for Gemini to follow. The Knowledge files are there to be referenced in your chats with the Gem. Open a fresh conversation in week nine and both are already in place.

Conversations are the thing that does not travel, and Google documents this in a place nobody thinks to look. The help article Get personalization with memory of your past Gemini chats describes a setting that lets Gemini “learn from your chats to understand more about you and your world”, then lists where it is switched off. Among the limitations: “For now, this feature is ... not available in certain features, like Gems or Live chats.”

Read that as a design decision: a Gem answers from the brief you wrote, which is why it behaves the same in October as in September. The cost falls on everything you settled in conversation. An explanation the two of you finally got right in week three, a deadline you typed once, a correction you issued when it garbled a mechanism: each of those is sealed inside the chat where it happened, and week nine opens with none of it.

Two minutes a week closes that gap. Open one running document, name it after the course, and add whatever the Gem would otherwise have to be told twice: the exam timetable, the grade descriptors, the definitions your lecturer is fussy about, the topics you keep fumbling. Attach it under Knowledge. Whatever a future chat should arrive already knowing has to be written down where the Gem can read it.

Are Gems free, and what limits does Google publish?

Gems need no paid plan. The Gemini Apps help article Gemini Apps limits & upgrades for Google AI subscribers carries a feature availability table with four columns, headed Without a Google AI plan, Google AI Plus, Google AI Pro and Google AI Ultra. The Gems row is ticked in all four. Two conditions apply to everybody: you have to be signed in, and Google states that “to create and use Gems with a personal Google Account, you must also be 13 (or the applicable age in your country) or over”.

What a paid plan buys here is reading capacity. The same article publishes a context window of 32k tokens without an AI plan, 128k tokens on Google AI Plus, and 1 million tokens on AI Pro and AI Ultra, and describes that window as how much content “can be understood together at one time”. Google does not publish a separate figure for a Gem’s Knowledge section, so treat the plan context window as the honest guide to how much course material one Gem can usefully hold. A free account will manage a set of lecture notes. A year of readings is a different proposition.

On how many Gems you can create, Google publishes no number at all. The four articles in the Gems guide and the Use Gems article between them cover creating, editing, deleting and sharing Gems without naming a maximum, so treat the cap as unstated rather than as unlimited. Guides elsewhere that quote a figure are not getting it from Google.

There is a real ceiling nearby, and it is storage. The help article Upload & analyze files in Gemini Apps warns that “chats or Gems with uploaded files such as videos, photos, or files from Google Drive or NotebookLM take up more storage space in Gemini Apps”, describes a storage limit independent of Google Drive, and names deleting Gems among the ways to clear it. The same article caps a single prompt at 10 files, each up to 100 MB for anything other than video.

One last constraint. Google says that “for now, Gems can’t be used with Gemini Live”, so a Gem is a typing experience rather than a spoken one.

After the Gem has explained it

A Gem is built for conversation. You put a question, it replies out of your instructions and your files, and your eyes travel down the reply. Understanding a topic that way works. Producing the same content yourself, with every file shut, is a separate skill, and the second one is what an exam asks for.

On which of the two actually lodges material in memory, the research is lopsided. Dunlosky and colleagues (2013) graded ten widely used study techniques and handed a high utility rating to only two of them. One was practice testing, where you pull an answer out of your own head. The other was distributed practice, where those attempts get spread over days instead of stacked into one evening. Why the pair works best together is set out in the comparison of active recall and spaced repetition. A well-written explanation of material you already own reads like competence arriving, and that sensation is the part worth distrusting.

GeniusPal covers that second skill. Hand it the same chapter you attached under Knowledge and it writes questions off that material, which you then sit with every file closed. There is no dialogue in it and it reaches for nothing on the web, which makes it useless as a tutor and serviceable as an examiner.

The prices. A new GeniusPal account gets two study sets for the life of the account, which is about enough to test the idea on a single week of a course. Each of those sets runs to ten questions, all of them multiple choice, and a set can be sat twice. The Student plan is $14.99 a month and lifts the ceiling to 100 sets in a month, 30 questions inside a set, and the flashcard and written-recall modes over the same questions. Genius is $59.99 a year. The daily review assembles itself out of whatever you have got wrong so far, and no plan gates it.

Do the build in week one, while the syllabus is still the only document you own and the whole thing takes ten minutes. From there the upkeep is a file dropped in after each lecture. The alternative is describing your course from scratch to a blank prompt box every time you get stuck.