Of the 2,100 students who attend Kentridge Senior High School, only about a dozen make it into the Calculus AB classroom.

Only 14.3% of the nearly 4 million exams taken in 2013 earned this top score and Tracey is one of the only eight students in the world to achieve full marks..

"I've never had a pupil score a perfect score on any of our AP tests," said Kentridge headmaster Mike Albrecht.

However, Tran’s friends are not surprised by the result. "If anybody was going to get a perfect score, it was going to be Tracey," said Josh Curtis, her classmate.

Since a child, Tran was always fond of reading. Her parents used to force her to stop reading and go to bed. She describes books as escapism, but said maths brings her back to reality.

"We can solve so many problems with it. So now it's become like a passion," Tran said. 

For Tran, the credit belongs to her entire class. She calls calculus a community effort, and she plans to use her maths skills to give something back.

Following her success she is now a candidate for Merit national scholarship.