Hello! I'd like to improve the Aural as I find the Aural part in G.8 exam is difficult. Also I 'd like to improve my ear-taining. Anyone know how to improve? How to practice by myself? Thank you!

Have you got any of the Aural Training in Practice books published by the Associated Board? I also use Aural Time by David Turnbull.

Oh! I see! But, any practice I can do without the exam standard book?
Moreover, thank for your idea!

I find teaching the sight singing very difficult to Grade 7 and 8 students.....is there a particular method anyone can share? What if the student has absolutely no background in this training..... ? What to do?

do a google for earmaster pro - you can download a free 30 day trial of this software called an "ear trainer" - it has things like chord, interval and chord sequence recognition tests which are very user friendly and comprehensive.

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I find teaching the sight singing very difficult to Grade 7 and 8 students.....is there a particular method anyone can share? What if the student has absolutely no background in this training..... ? What to do?

Work up to it from an earlier grade.