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Keep the first attempt visible
Write the setup, answer and reason before opening the solution. In an NPV exercise, retain the cash-flow signs and period exponents you used. That record lets you identify the step that changed after viewing the explanation.
Use a changed condition to test understanding
After reviewing the solution, try a fresh task with a meaningful changed condition: for example, move an initial payment to a later period or change the coupon frequency. Replacing only the numbers may test arithmetic while leaving a misunderstood convention unchallenged.
Record the level of help
| Result | Interpretation for review |
|---|---|
| Solved and explained independently | Evidence for this task under its conditions |
| Solved after a hint | Identify the hint and practise its decision independently |
| Understood only after reading the answer | Schedule a fresh retrieval and application task |
Use the record to choose learning work
The categories describe how the attempt was completed. They are not calibrated estimates of exam readiness or future success. Use them to identify the next task rather than assign a pass-probability label.