AI detection on take-home exams and timed assessments
Short answers, written fast, under a template. The format produces exactly the text profile detectors score highest, and there is no draft history behind it.
Take-home papers and timed online assessments get scored like everything else, and they carry two disadvantages at once: the writing is short, and there is no record of it being written.
Why short answers score badly
Every detector is far more reliable on a document than on a paragraph. Turnitin's own figures show the size of it: 4% wrong on sentences against under 1% on documents, the same tool four times worse at the smaller unit.
A 300-word exam answer sits much closer to the sentence end of that scale than to the document end. Sentence-length variation, the strongest signal there is, needs a sequence of sentences before it means anything, and a short answer barely has one. See why detectors are unreliable on short text.
So the number on a short answer carries the thinnest evidence the format can produce, and it is usually presented with the same confidence as any other.
Why exam writing looks regular
You write to a template. Under time pressure everybody falls into the same shape: restate the question, state the position, three supporting points, conclude. Repeated structure reads as regular.
You write in one pass. No digressions, no asides, no second thoughts left in. The unevenness that reads as a person thinking gets skipped rather than edited out.
You signpost heavily. "Firstly", "Moreover", "In conclusion". Under pressure these are the scaffolding that keeps an answer organised, and they are also markers. Connectives open 2.4% of human sentences in our corpus against 5.8% of generated ones.
You use the taught phrasing. In an exam you reach for the formulation from the lecture, which is the most predictable phrasing available to you.
The record problem
For coursework, version history is the strongest thing you have. Google Docs and OneDrive keep it automatically, and it shows a document growing over hours.
An exam answer typed into a browser box has none of that. Some assessment platforms keep their own logs, some do not, and you generally have no way to know which.
Where the format allows it, drafting in a document with version history and pasting in at the end preserves a record that typing directly into a form does not. Whether that is permitted is set by the assessment's own rules, which vary and which we are not the right people to describe. See how to show you wrote your essay.
What is worth doing in advance
You cannot check an exam answer before submitting it. You can find out in advance whether your natural exam-writing style sits in the exposed group.
Run two or three old timed pieces, or a practice answer, and look at where they land. If they come back high, the reason is the format rather than the document, and the two habits worth breaking under pressure are heavy signposting and even sentence rhythm.
Half an hour of that, once, is the only preparation available for a format where you get no second look. See find your own baseline score.
Ours is free and unlimited with no account, has no word cap, scores every paragraph separately, and never stores your text. Wrong-flag rate on genuine human writing 0.4%, published, against Turnitin's 4%.