[2] In October 2016, he set a new national 200m breaststroke record at the Fina/airweave Swimming World Cup held at the OCBC Aquatic Centre, Singapore.

[5] A former student of Anglo-Chinese School (Independent), Khoo served national service in 2014 as a Special Constable Sergeant (SC/SGT) at the Tanglin Police Division.

Together with Joseph Schooling, Quah Zheng Wen and Clement Lim, the team also broke the 4 × 100 m relay game and national record.

[2] Khoo holds the record in the Short Course (25m) for the 50, 100 and 200 metres breaststroke and the 4 × 100 m relay with Joseph Schooling, Quah Zheng Wen and Rainer Ng.

[8] He also won Bronze in the 100m breaststroke event and another gold in the 4 × 100 m medley relay with Quah Zheng Wen, Joseph Schooling and Darren Chua.