Scoring a card selection 'game'

Hi there,

I am designing a simple card selection exercise, by which the user would select three (3) cards from a selection fo about 20. Based on the aggregate score, we can provide a description of the category in which the person’s score ended up and some recommendatios for improvement.

My questions:

Question 1: How can I associate a score with a card being selected? Would presenting a questions for their selected card 1 vs. 2 vs. 3 assist in this? and where could I then find this score associated with the individual image?

Question 2: How could I use a variable to accumulate the aggregate score, based on the 3 cards they selected?

Looking forward to your reply.

Thanks