The 18-year-old T46 athlete claimed a gold medal in the under-23 200m race at the IWAS (International Wheelchair and Amputee Sports Federation) World Junior Games in Stadskanaal, Holland.
Arnott had won a silver medal on Monday in the 100m event in a new wind-assisted personal best of 11.36 seconds.
The Paralympic hopeful, who has limited movement in his left shoulder due to Erbs Palsy, tweeted after his gold medal run: “IWAS World Junior Games has been a gift. Silver medal in the 100m and then gold in the 200m.”
Arnott also sent his thanks to everyone who had helped him on the way.
His next major event will the competing at the Olympic Stadium as part of the Sainsbury’s Anniversary Games in London on July 26. The event is part of the IPC Grand Prix series.