Turn every mistake into a better score.
The review after a drill is where the learning happens. Give every miss a cause and a next action.
Classify the miss
Was it a concept gap, a setup error, a misread question, or time pressure? Be specific: 'forgot to square the area scale factor' is useful; 'bad at geometry' is not.
Explain the correct path
Read the explanation, then close it and solve from a blank page. If you cannot explain a step, return to the underlying concept.
Write a one-line rule
Add a note to your error notebook: 'For similar shapes, square the length scale factor to compare areas.' Make the rule something you can apply next time.
Return after a delay
Revisit the skill tomorrow, a few days later, and the following week. Correct delayed retrieval matters more than immediately recognizing an answer you just saw.
Error: chose x = 3 when asked for x + y. Rule: underline the requested expression, then check it before submitting.