This section of the site has a number of free PDF downloads which will be useful for both piano and theory students. They are all free to use as you wish for non-commerical purposes, as long as you keep my name on them and the link to my website at the bottom.
Sight reading: Examples of the kind of sight-reading tests you might encounter in ABRSM piano exams
Integrated Theory: Piano pieces with built-in theory exercises
Technique: Pieces with a particular pedagogical goal in mind
Worksheets: Written exercises which are not ‘playable’ in the same way as the Integrated Theory pieces