Sheet music

• www.gmajormusictheory.com has lots of free graded sheet music of popular tunes, and is particularly good for early stages.
  
• www.pianostreet.com has free sheet music and help with scales and arpeggios
  

Exam material

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• http://gb.abrsm.org/students has helpful hints and tips regarding exams
• Music Maestro has some sample aural tests.
• http://gb.abrsm.org/en/exam-support/on-your-marks/ Be an examiner - have a go at marking a grade 5 piano exam. 
• musicalresources.blogspot.com Excellent advice for all parents of piano pupils.
• www.aaastateofplay.com/a-musical-playground-for-kids-music-theory-lessons/  An American theory website which, although I haven't explored it very thoroughly, looks OK to me.
  
• www.mymusictheory.com .
  





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If anyone knows of any more good websites, please let me know.