An Asian-American student has become the very first to get a perfect score on the AP Physics exam.

Sixteen-year-old Jason Xia, now a junior at Naperville North High School in Illinois, sat for the AP Physics 1 exam in May.

Then a sophomore, he just wanted to get enough correct answers to earn the maximum score of 5, the Chicago Tribune said.

But Jason got more than he hoped for. As it turned out, he is the only student who has scored 80 out of 80, the College Board confirmed last week.

It’s a worldwide feat as he stood over 170,144 fellow examinees. Below 5% scored 5 and only 14% scored 4.

He said it was just “luck”:

“I was pretty surprised. It’s obviously not what I was expecting.”

Jason “wasn’t freaking out” when he went through the exam. At the end of it, he was confident in securing a 5, though he was unsure of some items:

“I think there were multiple choice questions I didn’t know if I answered correctly.”

Jason’s parents, who both work in computer science, were surprised at their son’s accomplishment. Meanwhile, his teachers praised him for his hard work, dedication and intelligence.

He plans to pursue a STEM (Science, Technology, Engineering or Mathematics) field in college.