Hi

The sight reading will be a piece approx 2 grades lower than your performance pieces. The board publishes specimen tests but you could use a book of grade 3 pieces to prepare.
The aural.........
A. To sing or play (at your choice) from memory a short melody that you will hear twice. The examiner will state the key and the starting note.
B. To sing six notes from a score in free time. The range will be up to a fifth above or a fourth below the tonic. There wont be any intervals greater than a third.
C1. After listening to a piece played by the examiners, identify features such as dynamics, tempo changes, tonality, general info on texture, form, style and period, articulation.
C2. To clap the rhythm of an extract of the piece you just heard. It will be played twice. You must then stae the time as 2,3 or 4.
The board publishes practice aural tests on tape for all the grades.
Hope this helps
