Can anyone rate the difficulty of this score?

[playingpiano123]

Hello, can anyone please let me know what (ABRSM) grade level the score below is? (this is not for taking the ABRSM exam btw).
Personally, I'd give it a 6, 7-ish (simply because I believe it takes a lot of attitude to play), but I need more opinions.
Thank you!

https://musescore.com/user/27136270/scores/6768105

[pianistavt]

Yes.
Intermediate.
Why the need to attach an ABRSM number unless you're progressing through their program? 
Probably no more difficult than a challenging Joplin rag - Easy Winners, for example.

What strikes me is the switch to a-flat minor at the end - 7 flats.  Wouldn't g# minor (5 sharps) work?  The original score for singers can't be like that.