Health, grades and streaks
Practice rules · version 1
Topic health
We keep your best released score for each different question part. Accuracy is marks earned divided by marks available on those answered parts. Evidence is the number of different answered parts divided by ten, capped at one.
Health = accuracy × evidence × 100, rounded to a whole percent. One correct one-mark question gives 10%; five different correct questions give 50%; ten give 100%. Repeating the same question improves its best score but adds no evidence. Unanswered questions, new papers and answers that could not be marked reliably do not lower this score.
Subject health and Expected Grade
Subject health is the rounded average of your started topic scores. Topics you have not started show 0% but are excluded from this average. A new subject starts at E (0%) as a baseline, not an assessed exam result.
| Practice health | Expected Grade |
|---|---|
| 80–100% | A* |
| 70–79% | A |
| 60–69% | B |
| 50–59% | C |
| 40–49% | D |
| 0–39% | E |
This is a motivational practice estimate, not an official qualification grade or a guarantee of passing. It does not model paper weighting, Core/Extended entry or practical components. Official thresholds vary by paper and exam series. How official thresholds work.
Seven-day change
The arrow compares your current score with a snapshot exactly seven days earlier. Changes are percentage points: 20% to 35% is ↑15.0%. Starting a weaker topic can lower your subject average. Historical snapshots exclude answers or marks recorded after that date.
Daily streak
One completed answer earns a day, even if it is wrong or could not be marked reliably. Failed requests earn nothing. Days follow your browser’s time zone. Your streak stays alive through today if you practised yesterday, then resets if you miss a whole day. Repeating answers on one day still earns only one day. The calendar runs Sunday to Saturday. There are no freezes, backdated days or bonus days.
These are LetStudy’s published rules. The display follows the reference site, but its private scoring formula has not been verified. Until accounts are connected, history belongs to this browser.