If you get familiar with scripting and counting scores you might experiment with variations.
Is the student allowed to give an exercise a second try or do I want a result that explicitly rapports how many exercises were answered correctly from the first time.

Create a number made = 0

Let the value of made increase by 1 when an answer is given

Let the values of solution ans trials only increase when made = 1.
If you try a second answer for the same exercise made will be increased to 2
and the values of solution ans trials will remain the same.

Clicking on the button next exerciseresets made to 0.

Of course you have to explain this way of counting in advance to the students.
Eventually a student can correct the exercise but this result won't be count.