Hiding quiz feedback layers in final assessment

Hi, I'm working on a final assessment with 4 quiz questions. I want the user to be able to answer all questions and NOT see the specific feedback after each question. S/he should be able to proceed until the result slide (even if  one or more answers are incorrect), see his/her full score in the result slide and after that, have one more try. 

Since the quiz layers are pre-built, I cannot figure out how to hide the quiz-specific correct/incorrect -layers.

How do I make this work?

Anu