Result slide - not progressing till 100%

When the generic result slide comes up, you have your 'Review Quiz' and 'Retry Quiz'.


I've added another button that says Continue, but I don't want this button to be enabled until the client has gone over the quiz enough times to get all of the questions correct (however many times that is - no limit). 
I'm having issues trying to organise the triggers to make the button go from 'disabled' to 'normal' only when the pass rate is 100%.

If someone could help me out or refer me to a previous post that would cover this issue, it would be greatly appreciated. 

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