(Mishawaka, IN) - A northern Indiana high school student is celebrating rare perfection.

 

Felix Zhang was one of hundreds of thousands of kids who took the AP calculus exam each year. But, the Penn High School junior is believed to be the only student in the world to achieve perfection on the test.

 

The test score ranges from 1 to 5. Not only did Felix get a 5, but he received a perfect score by answering every problem correctly.

 

Zhang told ABC News he was just focused on doing his best.

 

“It was really nice being able to have like a perfect score,” Zhang said.

His score was 108 out of a possible total of 108 points.

 

Zhang was one of 270,000 students worldwide to have taken the AP exam in May 2022, when he was just a sophomore.

 

About 20% of students who took the test at the time earned a score of five, the largest percentage since 2016.

 

Zhang said he also told his parents, who were proud of him for his accomplishment.