The beat the song is built on is a 2-bar phrase, played through bars 1-3, 5-7 and 17-19, and 10 more places -- 62.1% of every bar the kit plays. Learn that one and the song is very nearly finished.
It is played on ride, snare and kick, counted in sixteenth notes. On its own it scores 73 out of 100 -- demanding -- and the thing that decides that is the independence between the hands and the feet.
The whole song is 81 out of 100, so the beat is most of what the song asks for. Get it clean and the rest follows.
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 77 BPM -- and adds the notes back over 5 rungs, each with a tempo to reach and a gate to pass before the next.
Tempo goes 77, 93, 109, 124 and 140 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 2-bar phrase on ride, snare and kick, in 4/4 at 140 BPM, counted in sixteenth notes. It is written out above, and it covers 62.1% of the bars the kit plays.
Bars 1-3, 5-7, 17-19 and 21-23, and 9 more places.
73 out of 100 on its own -- demanding. The song as a whole is 81 out of 100. Hard, and what makes it hard is the independence between the hands and the feet.