Learn that Q almost always pairs with U to say "kw," and that X usually appears at the end of a word saying "ks."
Q and X are the rare birds of the alphabet. Q almost always teams up with U to say kw, like in "queen." X mostly hides at the end of words, saying ks, like in "fox."
You will not see these two as often, but now you will know them when you do.
Mastery looks like: They recognize the kw sound for Q and know that X usually appears at the end of familiar words, saying ks.
Common stumbles: Expecting X to start words the way other letters do; forgetting that Q needs U right next to it.