This is an awesome song and amazing that Rockschool included it in the Electric Debut grade.
Pink Floyd released this in 1979 and it still remains their most commercially popular song. Off the album, The Wall, it really is a classic.
The first video here is the free lesson. This has a quick intro then a play through of the song, where you can see the written music as I play it as well as chord diagrams. This will be really helpful when you are practising playing along to the backing track.
The full lesson, accessible below if you subscribe, has much more. There are:
Tone tips - which pickups to use, amp settings etc
In depth lesson on Section A and Section B
A walk through of all the chords with the best way to play them.
Some tips for adding a bit of your own skill and personality in the song.
And more.
Here's the free play through. Have Fun:)
And here's the Full Lesson, with all the Good Stuff: