The beat the song is built on is one bar, played through bars 85-92 and 97-120 -- 26.7% of every bar the kit plays. That is the spine of it; everything else is what happens around it.
It is played on crash, snare and kick, counted in sixteenth notes. On its own it scores 26 out of 100 -- a fair first song -- and the thing that decides that is the independence between the hands and the feet.
The whole song is 78 out of 100, so the beat is not the hard part: what costs you is everything around it, the joins and the fills.
A part this hard is not learned by playing it slowly and hoping. The room opens it on its simplest reduction -- the timekeeper alone, at 135 BPM -- and adds the notes back over 3 rungs, each with a tempo to reach and a gate to pass before the next.
Tempo goes 135, 158 and 180 BPM, and the gate at each one is 8 loops in a row with no wrong note and no wobble in the time.
PRACTISE THIS BEAT →A one-bar groove on crash, snare and kick, in 4/4 at 180 BPM, counted in sixteenth notes. It is written out above, and it covers 26.7% of the bars the kit plays.
Bars 85-92 and 97-120. The time is kept on the ride to start with, and it changes 8 times over the song.
26 out of 100 on its own -- a fair first song. The song as a whole is 78 out of 100: demanding, mostly on how many notes a second it asks for.