You have to calculate the test score yourself. Simply have one action for each question. Something like this:
Modify variable: num_right = 0 Modify variable: Add 1 to num_right if Question_0001 Is Correct Modify variable: Add 1 to num_right if Question_0002 Is Correct etc. Divide num_right by xxx (total number of questions) Multiply num_right by 100 to get %