Yes, with checks. CoreMark Coach, the AI tutor for Cambridge Lower Secondary Stage 9, draws diagrams inside Claude and is built to check them against the question. No AI is perfect, so check that the numbers match, the shape fits the numbers, and nothing extra is labelled. Turn on Code execution and file creation first.
CoreMark makes CoreMark Coach, so we describe its diagram rules as the maker. The checks in this guide work on any AI tutor's drawings.
Diagrams are where parents trust AI least, and they are right to be careful. A wrong number in a sentence is easy to spot. A wrong angle in a neat drawing can look perfectly convincing to a 12 year old who is still learning what an obtuse angle looks like.
This guide gives you a set of questions to ask of any AI-drawn diagram, whether it comes from CoreMark Coach or another tool. It also explains what Coach is designed to do, so you know what to expect.
Before you start
- 01Diagrams in Coach are drawn inside Claude, so the Claude setting Code execution and file creation must be on.
- 02Coach is designed to check its own diagrams, but no AI is perfect. Treat every diagram as something to verify.
- 03The Claude account must belong to an adult (18+), so the parent holds the account.
Does every number and label match the question?
Start here, before you look at the shape. Read the question text, then look at the diagram and list every number, angle, unit and letter in the picture. Each one should appear in the question, and each value the question gives should appear in the picture.
A diagram that shows 56 degrees when the question says 65 is wrong, however tidy it looks. The same goes for a missing side length the question needs, or a point labelled B where the question asks about A. Angle questions are where this bites most; the post on why geometry and angle problems get harder covers the topic itself.
Does the shape look like the numbers say?
Check the geometry against the values before anything else. An obtuse angle should look obtuse, which means wider than a right angle. A 30 degree angle should look small, and a right angle should carry a small square.
Sides are the same test. If two lines are marked equal, they should look equal, and if a triangle is labelled as having one long side, the drawing should show it. Parallel lines should be marked as parallel, usually with matching arrowheads.
Is anything labelled or coloured that the question does not need?
Extra labels are a problem because they can give away the method, or lead a child to use a value the question never asked for. A good diagram labels only what the question needs.
Colour should mean something. In a force diagram, one colour might separate the forces acting on an object from the resultant. If colours are only decorative, or there are more than three colours plus black, ask why they are there. Coach is built to use no more than three colours plus black, and only where colour carries meaning.
When should a diagram say NOT TO SCALE?
A diagram should say NOT TO SCALE whenever its lengths or angles are not drawn to the stated values. If the picture is a sketch and no note appears, the proportions may be misleading, so rely on the numbers in the question, not on how the drawing looks.
Coach is built to add that note when values are not to scale. Its absence is a reason to check, not proof of an error.
What should you verify for each common diagram type?
Each type of diagram has its own usual failure. Use this table as a quick guide when you sit down with your child.
| Diagram type | What to verify |
|---|---|
| Angles in parallel lines | The parallel lines are marked as parallel, the given angle has the value in the question, and the angle you are asked to find sits in the right place relative to the transversal. |
| A circuit | Each component is the one the question names, the cell and bulbs are connected in the stated way (series or parallel), and any ammeter or voltmeter is placed where the question puts it. |
| A plant or animal cell | Every labelled part is a part the question asks about, each label points to the right structure, and the cell type (plant or animal) matches the question. |
| A line graph | Axis labels and units match the question, the scale is even, each point sits at the value stated, and the line joins the points the question describes. |
| A flowchart | Every decision has a yes path and a no path, the arrows follow the order the question describes, and the start and end boxes are both present. |
| A number line | The end values match the question, the marks are evenly spaced for the scale used, and any open or closed circles match the inequality. |
What is CoreMark Coach built to do with a diagram?
As of 20 October 2026, CoreMark Coach is built to follow a fixed set of diagram rules. The diagram is drawn before the question text appears, so the picture is part of the question rather than an afterthought. It labels only what the question needs and keeps the drawing flat and uncluttered.
Coach also runs a consistency check: every number and label in the drawing should match the question text, and the geometry should visibly match the values, such as an obtuse angle looking obtuse. Where values are not to scale, it adds a NOT TO SCALE note.
When a child draws a diagram on paper and uploads a photo, Coach is built to draw the correct version and compare the two, naming the specific differences. If graphics are not available, it falls back to a text drawing for simple cases such as number lines, flowcharts and truth tables, or it swaps the question for one that needs no diagram.
Diagrams only appear when the Claude setting Code execution and file creation is switched on. You can find it under Settings, then Capabilities. According to Anthropic's help centre, this setting is available on all plans, including Free.
What checklist should you screenshot before trusting a diagram?
Save this list on your phone and run through it each time a diagram appears in a session.
- Every number in the picture appears in the question, and every value the question gives appears in the picture.
- The angles and sides look like their stated values, so an obtuse angle looks obtuse.
- Only the labels the question needs are shown.
- Colours separate things that matter, and there are no more than three colours plus black.
- A NOT TO SCALE note is present wherever the drawing is not to scale.
- The diagram type matches the table above, and its key features are all there.
- If anything looks off, ask Coach to show its working or redraw the diagram.
How do you get a wrong diagram corrected?
Ask Coach to redraw the diagram and say exactly what looks wrong, such as the angle value or a missing label. Then ask it to show its working so you can see how the values feed into the answer. Coach is built to say so and replace a question if it spots its own mistake.
Check against a second source when the diagram matters for a mark. Force diagrams carry the same risk, because a wrong arrow changes the answer; for the topic itself, see why forces, energy and motion calculations trip kids up. A CoreMark booster PDF prints its own diagrams, and for a fixed paper question a printed diagram in a booster or a textbook can be the better reference. If the two disagree, treat the printed one as your first reference, since it was drawn once and checked, and ask Coach to explain the difference. Printed diagrams can contain errors too, so the textbook or your child's teacher has the last word.
Where do AI diagrams still go wrong?
This section describes general failure modes, not specific examples. CoreMark has no screenshots or recorded examples of Coach's diagram output to show here, so please do not read this as a catalogue of observed errors.
In general, AI drawings can fail in a few ways. A drawing can look tidy while one value is wrong. A shape can be drawn to the right proportions while its labels point to the wrong part. A chart can have a scale that looks even but skips values. A flowchart can have arrows in an order that reads well but does not follow the question. These errors are easy to miss when the picture looks confident, which is why the checks above come before the look of the drawing.
Coach is built to check its diagrams, but no AI is perfect. Use the checks in this guide every time, and use Coach alongside a printed booster or textbook, not as a replacement for them. If you want to see how the practice itself works, read how Coach runs learn mode and exam mode.
See how Coach handles diagrams
Coach is a paid product, not a free one. As of 20 October 2026 each stage costs ₹9,999 per school year with no subscription, and it runs only inside Claude. Read the full description before you decide.
Frequently asked questions
Yes, CoreMark Coach can draw diagrams for Cambridge Lower Secondary Stage 9 Maths and Science, as on-the-spot graphics inside Claude. Coach is built to check each diagram against the question, but no AI is perfect, so a parent should still check the numbers, shapes and labels before relying on a drawing.
The Claude setting Code execution and file creation must be on. You switch it on under Settings, then Capabilities. According to Anthropic's help centre, the setting is available on all plans, including Free. Without it, Coach cannot draw diagrams and will fall back to text or a question that needs no picture.
Check that every number and label in the picture matches the question, and that the shape matches the values. An obtuse angle should look obtuse. Also check for extra labels the question does not need, colours that carry no meaning, and a missing NOT TO SCALE note where the drawing is not to scale.
Your child can upload a photo of the drawing. Coach is built to draw the correct version and name the specific differences. Check the correct drawing against the question yourself, and if you are still unsure, compare it with a printed booster diagram or a textbook.
For a fixed paper question, the printed diagram in a booster PDF is a stable reference because it does not change between sessions. If the two disagree, treat the printed diagram as your first reference and ask Coach to explain where its version differs; your child's teacher has the last word. Neither source replaces checking the question wording.
No. Drawing a diagram by hand is part of exam practice, and a child who can only recognise a correct drawing may struggle to produce one. Use the AI diagram to check a working answer, then have your child redraw it from memory to confirm they can do it alone.
Sources & further reading
- Anthropic Help Centre, "Create and edit files with Claude" (Code execution and file creation setting), support.claude.com
- Anthropic Help Centre, "Minimum age requirement for accessing Claude", support.claude.com
Last updated 20 October 2026. Details about other companies and research were checked against their own pages on 20 October 2026; check current terms, features and prices before you decide.
CoreMark Coach is an independent product that runs in Claude, made by Anthropic. CoreMark is not affiliated with Anthropic or with Cambridge Assessment International Education. AI can make mistakes: check important answers, and supervise your child's use.