How Edustello uses AI
Stello 1
Being straight about this matters more than sounding clever, so here it is in full.
Edustello uses AI to generate and evaluate practice questions. AI can make mistakes. Always verify important information using your official study material. Edustello is not an official examination provider and cannot guarantee exam results.
What the AI actually does
- 1
Reads your material, if you gave any
Text is extracted from what you paste, upload or link, and split into passages. Nothing is invented at this stage — if a PDF is a scan with no readable text, we say so instead of guessing. You can also describe a subject and supply nothing, in which case the exam is built from established subject knowledge alone.
- 2
Works out the topics
The AI identifies what the material covers and how much space each topic gets, so the exam is weighted the way the material is.
- 3
Plans, then writes
It plans the exam first — one line per question saying exactly what that question will test — then writes the questions against that plan. Planning first is what stops five questions testing the same fact.
- 4
Checks its own work
A second pass reviews every question against your material. Anything that fails is rewritten, up to twice. If it still fails, it is dropped rather than shown to you.
- 5
Marks your answers
Multiple-choice answers are marked against the stored answer key — deterministically, never by a model. Open answers are marked criterion by criterion against a rubric generated with the question.
What every question is checked for
- The answer is supported by your material, or by established subject knowledge when the material does not cover it
- The question can only be read one way
- A multiple-choice question has exactly one defensible correct option
- Wrong options are tempting but definitively wrong
- The difficulty matches what you asked for
- It doesn't duplicate another question in the same exam
- It tests something worth knowing, not trivia or page furniture
- Every question is labelled with where its knowledge came from, so you can tell the two apart
Where it can still be wrong
Marking an open answer is a judgement. A correct answer phrased unusually can lose a point it deserved. The per-criterion breakdown exists so you can see exactly where a mark went and disagree with it.
Your material may be ambiguous, and general knowledge may be dated. If a chapter contradicts itself, or a summary omits a caveat, the exam inherits that. Questions written from established subject knowledge carry the model's understanding rather than your syllabus, which can be out of date on anything that changes. Each question says which of the two it came from.
Nothing here reflects your real exam board. Edustello writes exams in the style you ask for. It has no access to your actual syllabus, past papers or marking scheme.
What we don't do
We don't invent a source. A question written from established subject knowledge is labelled as exactly that and carries no quotation from your material — it never borrows a citation it does not have. We don't pass off a shorter exam as the length you asked for either: if fewer questions survive the checks, you are told the number and choose whether to keep them.