The beat the song is built on is one bar, played through bars 3-5, 7-13 and 15-21, and 12 more places -- 70.7% 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 55 out of 100 -- a step up -- and the thing that decides that is how much of it falls off the beat.
The whole song is 71 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 65 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 65, 77, 88 and 100 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 100 BPM, counted in sixteenth notes. It is written out above, and it covers 70.7% of the bars the kit plays.
Bars 3-5, 7-13, 15-21 and 23-25, and 11 more places. The time is kept on the silence to start with, and it changes 1 time over the song.
55 out of 100 on its own -- a step up. The song as a whole is 71 out of 100: demanding, mostly on the independence between the hands and the feet.