Also, for QR I believe that refreshing the kind of mental maths that they do in year 7 /8 can be really helpful. You can get those year 7 maths work books and just work your way through it. But say, do a set number of pages in a certain amount of time . There are also Year 7 flashcard quizlet type videos on YouTube which can be useful.
For many it's not the maths which is difficult it is just doing the mental maths with the timing pressure. So practice at that can be helpful.
QR might not be something you wish to improve but it may help others.
For all of them improving speed reading and comprehension is really helpful.
Also look at the info on YouTube that covers strategies like flagging and skipping etc.