I bought this book thinking it would be good SATs practice for my class (higher ability Year 6 - half are already level 5s, need to get the other half there!). Though we've only done the first test as yet, the standard is not SATs standard, the test was significantly easier than a KS2 SAT mental. I would say it is good practice for borderline 3/4s, but not for the level of my class. They may get progressively harder, but that doesn't help me as much as I can't then see the progression of the children as easily.
I have bought the Year 3 book and I thought that it was very appropriate, so I'm a little disappointed that this one missed the mark.