Deselecting answers before submitting on freeform quiz

Hi there Here's, hoping someone can help me out. I'm hitting a roadblock with this one quiz question. 

We are trying to gamefy the course somewhat, so have built the quiz questions to track a point for every correct answer. We built this so that when they select the answer, the variable is changed from False to True, then on submit it counts a point for each true on the correct choices. However, if they select then decide to de-select the choice, it doesn't move it back from True to False...I've tried numerous combinations of variables and states and still can't seem to get it to work. Any help is appreciated! 

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