These are looking great. Fantastic stuff for a younger demographic. Speed it up and add a solo section in, and the older demographic could probably get a kick out of it as well.

However, your grading scale may be slightly confusing. I'm not sure of the grades in Britain, but in the US, most children do not start with instruments until the 6th grade. And, we also have a musical difficulty scale ranging from 1-5: I'm sure you could guess that it would not be considered 4-5 under that scale.

However, the composition is great again. It's nothing short of what you could expect.