Armaan, playing for Bandra school Rizvi Springfield against Raja Shivaji of Dadar, struck as many as 77 fours in 490 balls at the Karnatak Sports Association ground at Cross Maidan in South Mumbai before he was caught behind two short of a well-deserved 500.
Incidentally Armaan's 498 also bettered the record set last year of 439 by Sarfraz Khan in the Harris (under 16) Shield inter-schools tournament.
Armaan, who was 295 not out last evening, later said Sachin Tendulkar, who had created the world record school-level partnership of 664 with Vinod Kambli in the Harris Shield, was his idol.
"Sachin Tendulkar is my idol. I was not looking to set records but wanted to bat as long as possible," he said after his marathon knock lasting more than eight hours.