Sustained cursor control on a Lissajous-path target moving at competition speed. Measured in time-on-target and average normalised distance from the crosshair.
A score of 74 on Tracking means: you held the reticle inside the target for 78% of the 30-second window, with mean distance of 0.28 target-radii. That places you in the top 22%, past the Rifler floor, short of the AWPer median.