RI were second in 44.17 seconds, while Victoria School won the battle for third in 45.39s, with only 0.13 seconds separating them and sixth-placed St Patrick's School.
Dylan Tan of Hwa Chong Institution came in second in 4:32.41, while Catholic High's Chester Lee ran a 4:32.61 to finish third.
Anglo-Chinese School (Independent) (ACS(I)) finished second with a time of 45.90 seconds, while Hwa Chong Institution were third in 46.52s.
Singapore Sports School's Muhammad Syazani bin Abdul Wahid, the defending champion, had to settle for second place after finishing just 0.01s behind. His schoolmate Joel Ho was third in 11.62s.
Joshua Goh (ACS(I) #13) led the charge with two tries, as ACS(I) were able to put seven tries on the board against SJI.
RI's Tan Chong Qi defended his boys’ B Division 2000m steeplechase title with a timing of 6 minutes 43.17 seconds.
Thiruben of National Junior College came in second in 4:36.12, while Syed Hussein of Pasir Ris Secondary finished third in 4:39.84.
RI's Jordan Chia clinched gold in the boys’ B Division Shot Put with a throw distance of 14.02 metres.
