Scoring is based on a mixture of your Accuracy and Velocity. Accuracy is judged by how close you hit towards the center of the cue (the very center of the cue, not just the white spot on the cue) while Velocity is based on your peak rate during that swing towards the cue, using both of these statistics we are able to generate a cue score. This generated score will then be multiplied by the multiplier that the player gains by holding a continuous streak.
It may also be useful to look at the color of the scores during your workout to determine how on-target you are:
Green: On Target
Yellow: Needs adjustment