Arousal

rhythm for scales: tetrachord fingering, incremental rhythm

student's mind is not up to speed with his chops, needs to listen to himself while he practices (emphasize time), he is ahead of the metronome

get him to record himself and tap along / get a friend to do it

chopin etude - 2 under 3
bartok - student responds well to instruction in loosening time, maybe standardize that across teaching

slower tempo to get more precise articulations?
if he learns to maximize detail in the moment that will fix the speeding up issue

practice faster AND slower