Know why you got stuck.
Separate missing knowledge from recognition, strategy and local errors. “Careless” isn't a useful conclusion until you've located the failure.
The most useful part of a missed problem isn't the answer. It's knowing what to notice, choose or check next time.
Independent contest practice, with a structured review.
Check whether you can rebuild the solution independently.
A new problem checks more than your memory of the original.
Separate missing knowledge from recognition, strategy and local errors. “Careless” isn't a useful conclusion until you've located the failure.
Make your own diagnosis, question the proposed analysis and complete a focused repair task. The aim is a better next decision.
Return without hints. Then see whether the idea survives when the story changes and the cues become harder to see.
Recurring failures and repair evidence appear as you build a reviewed history. Until there is enough evidence, SolveTrace says so. The training queue keeps the next action in view.
Find the first meaningful failure.
The same problem, later. No hints or previous work.
The same idea with different surface details.
The same structure with less obvious cues.
The principle in a substantially different setting.
Solve independently. Review your reasoning. Know what to test next.