Map Every Exam Error to the Source That Fixes It — Free
Marking a paper twice produces the same list of mistakes in slightly different order. What changes the next paper is knowing which mistake recurs and which page, past question or walkthrough actually fixes it.
The proof surface
Free path: the tool computes locally in this browser with no key and no account. Where an AI step helps, any free chat assistant works — free tiers exist (Google AI Studio, Groq), but plans and limits change, so check the provider's own page. No third-party service is claimed here as verified: UNCONFIRMED — model has no browsing access this session.
Why the flat version breaks
A list of mistakes has no sources in it, so revision defaults to re-reading everything. Mapping each error to the specific material that addresses it turns the same list into a short, targeted reading order, and the unsupported rows are the honest gaps.
How to use the exam error source label in four passes
One-off slips are noise; errors that recur are the ones worth a revision row. Work through two marked papers side by side and keep only the mistakes that appear in both.
Use the numbered key: class notes, past paper, formula sheet, walkthrough. A row with two numbers is usually a genuine pattern rather than a single misunderstanding.
The label flags errors with no source. That gap is the one that costs marks next time, and it is also the most useful question to take to a teacher.
Print the label, fix the unsupported error, and then go through the sourced rows with the material open. The label is a revision order, not a record of failure.
SAMPLE DATA, NOT A VERIFIED CLAIM: the starter record maps seven physics errors to a four-part source key, with one row still unsupported. Replace these values with your own source before you rely on anything.
What breaks first
Listing every mistake without filtering
A label with thirty rows is a transcript of the mock, not a plan. Recurring errors only, and the label stays usable.
Naming the source as 'revise topic 4'
Topic-level sources send you back to rereading. The useful source is a page, a question number or a walkthrough you can finish in ten minutes.
Assuming the same error always has the same cause
Unit conversion failures are sometimes arithmetic and sometimes a missing formula. Two sources on one row is a sign the cause is not settled yet.
What you pay otherwise
| The usual route | What it leaves out | Cost |
|---|---|---|
| A revision-course subscription | Monthly fee for topic lists that do not reference your own marked papers | $15–$45 a month |
| Re-reading the whole topic | Hours spent on material you already know, while the flagged error stays unfixed | the evening |
| Missing the same mark twice | One unsupported error recurring in the real paper | the grade boundary |
| This page + the free exam error source label | Computed in your tab, result on screen before you type anything | $0 |
Try the free exam error source label right here
Load the starter physics errors and clear a source number from one row to see it flagged.
FIRST-LOAD · sample record filed
Take it into the free exam error source label
The companion app runs the same logic with a numbered intake, three starter records, a stateful share link, the one-time printable layer, and the local history shelf.
Open the free exam error source label →Keep the work if you will use it again
The full label: every error with its sources and coverage, the unsupported rows flagged and the source key printed, unlimited re-runs.
The on-screen result is free and complete. The one-time layer adds a tangible file you keep and the saved history that comes with it.
Boundary: This maps your own marked errors to material you already have; it does not mark work, predict grades or replace teaching. Marking schemes and grade boundaries come from the awarding body and your school — confirm any result with them.