Don't be late to the exam center. Try to enjoy playing the music inside the room.
Remember to take everything, ID cards or handbook with photos + English name, admission form, books for the exam pieces...
You can choose having scales or pieces first. About sight reading and aural, the examiner would decide the order. MOst of them would ask the candidates having sight reading first.
Echo singing is not difficult for grade 1. ask your kid to have confidence when singing. :)
Good luck!