📓Practice-Test Ledger

What it is

This records what you expected to score on a practice test alongside what you actually scored, and tracks the distance between the two over time. That distance is called calibration, and it predicts exam-day surprises better than the score does.

How it works

Each attempt stores a prediction, a result, and a date. The gap is the absolute difference between them, and the summary compares your average gap across recent attempts against your earliest ones — so the measure is the direction of travel rather than any single number.

Getting the most from it

1. Write the prediction down BEFORE you sit the test. A number guessed afterwards is not a prediction, and the gap it produces measures nothing.
2. Log every attempt, including the poor ones. A ledger with the bad days removed will tell you that you are perfectly calibrated right up until the exam.
3. Give it at least four attempts with predictions before reading anything into the trend. Below that, one unusual test dominates.
4. Export the CSV occasionally. The ledger lives in this browser, so clearing site data would take it with everything else.

Reading your result

The headline is your recent average gap in percentage points. Under five is well calibrated. A gap that narrows across attempts means your judgement of your own readiness is sharpening; one that widens usually means the material got harder rather than that you got worse at judging it.

What it can't tell you

It measures how well you predict your own performance, which is not the same as how much you know — someone can be beautifully calibrated about being underprepared. It also cannot see whether a practice test resembles the real one, which is the assumption underneath every score in it.