My son is in y10 and plays electric guitar. He joined GCSE Music late because the other subject he was doing no longer had a teacher and he's struggling. The curriculum seems to be based on piano notation ( I am not a musician!) and he doesn't get it. I asked his ( in school) guitar teacher to prep him for the music theory that goes with guitar but he doesn't seem to do so.
Examining board is WJEC.
How can I best help him to make the jump from guitar notation to piano? I bought the ABRSM grade one theory book and we do a page a day but I don't know if it's going to be enough.