I think it depends on what area you're in (as the test formats are different depending on region), what the school does, what you do at home etc.
If your concern is English, I think this (in my experience) is taught in Year 5 - so if your DD is at the start of Yr 5 now, she'll get better at that as you go through the academic year. Certainly in my area (CEM) English is about comprehension and vocabulary - and the best thing for that is reading. Reading. And more reading. Do it together, ask questions about the text, make a note of the tricky / unfamiliar words.
I agree that 1 hour per week is enough for lessons - follow that up with homework, a couple of the 10 min tests and then lots of "learn through play" type activities - words searches, cross words, play Scrabble as a family, games like Articulate, Bananagrams etc. And reading. Have I mentioned reading

?
My absolute top tip is to nurture confidence - if your DD thinks she's doing well, she'll feel 100% more positive about it than giving her lots of exercises that overwhelm her or cause her anxiety. Remember the aim is to be at the required standard by September of Yr 6 when they take the tests. Expecting them to achieve say 90% on an assessment paper a year earlier (I was guilty of trying an assessment paper at the start of Yr 5) is not the right way to go about it. Good luck!