ABRSM publish a book of pieces by Weiss specifically for their grade 6-8 exams. They are all wonderful but a favourite of mine is the Menuet, which is grade 6.
I've suffered for my music. Now it's your turn... - Seasick Steve
Ana Espinosa 2014 Swiss spruce/IRW
Yulong Guo 2009 640mm scale cedar/IRW