UMAT scores do not tend to change your chance of entry at UoA medical school by a significant amount. This is due to the low weighting, combined with the usage of raw scores instead of percentiles, causing the scores from applicants to be very close/identical to each other with a narrow range. Eg. 70th vs 75th percentile may only have a raw score difference of 1.
This is also why we do not charge for an unnecessarily high-priced, time-intensive UMAT workshop. For more information, see our free UMAT video.