The scores are labelled with levels following this system:
Level 1 - for absolute beginners. The music is written with first-year students in mind.
Level 2 - for beginners.
Level 3 - for skilled beginners.
Intermediate - for intermediate players. Both for education and concerts. (equals level 4-6).
Advanced - for players beyond the intermediate level. Mostly concert relevant stuff. (equals level 7 and up).
The levels are only to be considered as a rough guide.