Am2s lighting circuit and data circuit

[mpratt263801]

Hi all, I need some advice for am2s retake I failed the lighting and data circuit and have no idea why! I wired the lighting with a neutral at each switch like the specification says, I am wondering if it was because I put the earths in connectors do these need to be connected into the back of the box even though it is plastic boxes? Also with the data circuit I connected up and all was working on the test so again not sure what I did wrong any advice anyone could give me to how they want it in the am2s I might see where I went wrong? Many thanks