The range we were sent went from early reading level 2 to foundation reading level 4 and we are using these to supplement the girls homework. Everybody learns also have a range of workbooks designed for older children who may have difficulty with their literacy skills so its worth having a look at those if that applies to your child.
As much as the girls actual reading levels are good I know that Elizabeth in particular struggles with her handwriting due to the aches in her fingers and Alisons can certainly do with some work too so we have started them both doing basic letter formations. I love the way the pages are easy to follow and not too daunting and the girls seem to really enjoy them.