Adjust score on second attempt in quiz

Hey.

I am doing a drag and drop quiz, where the user has 2 attempts.

Right now, the user gets 10 points if he answers correctly on the first try, and 0 points if he does not submit the correct result on either the first or second attempt.

But how can I adjust the given points if the user answers correctly on the second attempt? (try again)

This would be my ideal scenario:

1st attempt = 10 points

2nd attempt = 5 points

No more attempts = 0 points.

Thank you.