Hi Furkan,
In this case I think you should take the following steps:
(If you can't do a database retrieve, since the questions haven't been committed, you should retrieve them over association and the use the list operation activity ‘filter’ to filter only the questions where the boolean is true.)
Let me know if this helps!
You can add an On change microflow on all the answer booleans. As soon as an answer is marked as true you can increase the counter and if it marked back as false then you can decrease the counter.
Counter in this case being the variable you are using to store the final count.