Those mixed quizzes are top-level, from the entire category. For Master Masher, you need to go to the specific subcategory (after selecting the main category, select one of the subcategories displayed) and play the mixed quiz it offers. Since you have to move between subcategories to play each new one, you should be able to keep track of what you have done that day, especially if you are systematic about it.
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(Editor in Humanities, Religion, Literature and For Children)
That's all, folks!