UQ doesn't use percentile (e.g. 90%ile) but the sum of the 4 sections. Therefore, the cutoff may be at 2830 and they use tiebreaker (e.g. SJT and/or VR) to differentiate between the people with 2830.I would imagine that there be less people that require a tiebreaker to be used because the 90th ucat percentile essentially has three possible scores (2830, 2840 and 2850) to differentiate with; while everyone who got the 181 was compared for a tie breaker; I guess we will have to wait and see though