Use the remaining time according to the current task instructions and what the interface actually allows. McKinsey Solve formats can change, so your invitation and the official instructions for the version you receive should be the source of truth for navigation, review, and submission behavior.

If the task allows you to review prior inputs, spend the extra time checking for clear mistakes, missed constraints, or arithmetic errors rather than repeatedly reconsidering every judgment call. Unstructured second-guessing can create new errors without adding information.

If the interface does not allow returning to earlier decisions, focus on the current step and avoid planning around a review feature that may not exist in your version.

Practice the current format so you know which actions are reversible. On test day, use spare time for targeted verification, then submit when you have no specific issue left to check. For more detail, see the McKinsey Solve guide.