I've read on some other threads (more than a few weeks ago) that the editors are not keen on people just deleting their quiz templates.
So if I would start a quiz template and then decide another quiz format would be better suited, I suppose the best way is to stop working on the first (less suitable) template and to start a brand new one.
That may work for the most prolific authors, who have the right to work on several quiz templates at one time, but it does not cut the butter for someone who has not gained this perk (yet). I suppose the authors restricted to one quiz template at a time, would have to contact an editor in order to delete the less suitable quiz template.
A sound advice for all: think about which quiz template would be best fitting, before starting the template itself. Personally I set up the quiz in a separate Word document before choosing the template.
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I dreamt of spending a day riding a stallion. It was a nightmare.