I bought the Aural training in practice Cd for my daughter, and she found it of little use, because as others have said no answers, and if like me, you have no musical knowledg the book is of no use, as i cant play piano to help her.
Didnt want to spend her precious time in instrumental lesson time, working solely on aural, so I paid for a different teacher, who lives locally and teaches piano and she had about 6 half hour aural lessons with her for her Grade 7.
It really helped, and she got a far better mark in the Aural section than in Grade 6, and bumped her score up to a comfortable merit, so in my opinion money well spent, and it gave her confidence to tackle the section knowing what to expect, instead of dreading it!!