The beat the song is built on is one bar, played through bars 3-33, 35-40 and 60-64, and 3 more places -- 71.7% 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 72 out of 100 -- demanding -- and the thing that decides that is how many notes a second it asks for.
The whole song is 79 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 63 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 63, 76, 89, 102 and 115 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 115 BPM, counted in sixteenth notes. It is written out above, and it covers 71.7% of the bars the kit plays.
Bars 3-33, 35-40, 60-64 and 66-68, and 2 more places. The time is kept on the silence to start with, and it changes 5 times over the song.
72 out of 100 on its own -- demanding. The song as a whole is 79 out of 100: demanding, mostly on how many notes a second it asks for.