From the Publisher
For all Associated Board Requirements. Unique to this series of scales books is the Speedy Guide printed on the back covers. This spells out, in short-hand form, requirements for all grades and can be particularly useful when the candidate is ready to start playing the scales and arpeggios from memory.
Difficulty level, roughly compared to ABRSM exam grades. 0 is beginner, 9 is advanced (beyond grade 8).