Scoring for multiple Quiz Qs on one slide


I have a query regarding scoring. I have 3 Qs (2 multiple choice and 1 multiple response) on one slide (base layer) with one submit button.  This is done using Freeform - pick many. If I answer 2 out of the 3 Qs correctly, the Result slide still shows 0%, Fail. 

How do I get it to score based on the correctly answered Qs?

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Wendy Farmer