You can use logic to calculate the total score.

for example: you have a form with 2 score fields: Q1 and Q2.

Here, in our example, we have added a content field to pipe the answer and show the total score:

Now, go to the logic tab and add this logic:

if Q1 is answered, add Q1 to Score

and for the second question:

if Q2 is answered, add Q2 to Score

You can also use answer piping on the success page. So the users can see their total scores after submission.

This way, you can see calculated scores on your result page: