There is a growing market for sight-
reading exercises. Great to see, but it still comes down to the student doing this activity regularly. I became more than competent at sight-reading from an early age for two reasons; (1) I had an older sister who had lots and lots of music (all originals – there were no photocopiers then), and so I would pick up different pieces to play; (2) playing for my church required me to be able to play just about anything that was thrust in front of one (OK – it was mostly chordal and predictable harmonic gestures, as hymns etc were) – but this saw me gain a greater confidence. As well, my mother (who was a school teacher and would buy much music and exercise books (sight-reading and technical) – was great believer in owning the resources) purchased every available Sight-Reading book on the market at the time. But now there are websites which offer resources for students and teachers. Try this one. http://www.practicesightreading.com/
As various examination boards publish their own to help students and teachers understand the required levels for each grade. To download the Trinity College London Publications Catalogue 2011 for details about its full range of repertoire and teaching resources, go to http://www.trinitycollege.co.uk/site/?id=229