The beat the song is built on is one bar, played through bars 9-24, 27-42 and 47-86 -- 85.7% of every bar the kit plays. Learn that one and the song is very nearly finished.
It is played on hi-hat, snare and kick, counted in sixteenth notes. On its own it scores 62 out of 100 -- a step up -- and the thing that decides that is how many notes a second it asks for.
The whole song is 70 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 104 BPM -- and adds the notes back over 4 rungs, each with a tempo to reach and a gate to pass before the next.
Tempo goes 104, 123, 141 and 160 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 hi-hat, snare and kick, in 4/4 at 160 BPM, counted in sixteenth notes. It is written out above, and it covers 85.7% of the bars the kit plays.
Bars 9-24, 27-42 and 47-86. The time is kept on the snare to start with, and it changes 6 times over the song.
62 out of 100 on its own -- a step up. The song as a whole is 70 out of 100: demanding, mostly on the speed of the hand keeping time.