Moving the quiz to a different category is easier than it sounds in typed "instructions" lol so bear with me.
When you open the edit screen on your quiz, the current category is in a little window which has a drop down menu. Look for Humanities (it says ROOT:HUMANITIES I think) and click on that, then save the quiz. If you get a big red message telling you it's a root category and you can't put a quiz there, don't panic. Re-open the template and go to the drop down again, and all the Humanities sub categories will be there. You might have to save it in English first, then Grammatical and Lexical Terms, or it might let you go straight to Grammatical and...
Once you save it again, it's moved.
It sounds daunting, but when you have the screen in front of you, you'll see what I mean and it's easy to do, just a bit "fiddly".