Digital Workshop

Hello everybody, I'm in trouble, needing again the valuable help of genious minds of this forum.
In a quiz with 30 questions, I am using score points with variables ready Opus - (Score_Incorrect; Score_Percent and Score_ Value_Total).
My problem is in fact the user has free shipping among the 30 questions, as well as total freedom to delete and redo your answer to each question.
If by chance the user with a question in issue resolves to delete and reschedule the correct answer (action opus store score correct), this act affects the Score_Percent that never reaches 100%, even though the user can mark the 30 total points equivalent to all the correct responses.
Then the final screen where these scores are shown, although the score_incorrect score_value_total and show actual values, the score shows a value-percent wrong. So what can be done so that this bug does not happen?

Suggest you create a "Commit/Revise" Button trigger with an action that sets a Flag Variable. Only 'keep score' for answers that are committed, or are revised-committed.

If the student makes a choice to "Revise", you remove that previous score immediately. Only record the revised score for that single question when the student again clicks to 'commit' it. Solved.

Thanks again for your attention Lar_123.

Your suggestion seems logical but I'm not sure how to do this.
I believe there is a way to hold the variables Score_percent in score_correct or in score_incorrect. Knowing that the total score is 30, the score_percent notes at the end of the answers, when the user terminates the test by clicking on a button to get the results screen, the sum total of correct responses, calculate the percentage in the total that is 30 and writes the result to a variable that would be shown on the final screen.
But again the question, how to do this work right?