We do not recommend that pupils start at this level. However, for older pupils it is very important to carry on with this level because the number of words the pupil can spell increases enormously. At this stage, the pupil will progress very rapidly. More importantly, the continued use of the morphemic strategy will enable the pupil to remember new spellings much more easily.
This page of dicatation exercises shows the level of proficiency expected at the end of Apples and Pears Book D.
Sound Foundations, 5 The Leaway, Portchester, Fareham, PO16 8PH U.K.