Can a Quizzes.Next be migrated back to be a regular quiz? I don't want my students to be able to see the correct answer to questions, but there doesn't seem to be a way to turn that off in Quizzes.Next.
There is not any method that I know of to convert a Quizzes.Next quiz to a traditional quiz. Quizzes.next is still a beta product and as such there are some features "missing". Control of feedback and answers after the quiz has been taken is one of those things that still it not where it needs to be (my opinion).
But, I have some good news for you! I was just checking the release notes and that feature is being added with tomorrow's release. Check out the notes linked below and see if this will work for you. By Sunday I think you should see this new option in Quizzes.Next.
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