Transcript for The ultimate math whiz
- Do we always have to use that formula?
LIONEL MOISE: This morning, an Indiana high school student is celebrating rare perfection.
- I just told my parents and they were very happy about it.
LIONEL MOISE: He was one of hundreds of thousands of kids who take the AP calculus exam each year. The test score ranges from 1 to 5. Getting a 3 or higher is considered passing. Felix got a 5, but that's not the whole story. Lots of kids get a 5, but no one ever gets a perfect score.
- It is really nice being able to have like a perfect score. It is pretty surprising. That's right, Felix Zhang, who's only a junior, is believed to be the only student in the world to ever achieve perfection on the test. He got every single answer right, solving every single problem correctly.
- I wanted to do well on it and I prepared a lot, but I never actually thought about getting a perfect score before.
LIONEL MOISE: The perfect equation here was the support from his calculus teacher Miss White and Felix's parents, who just happen to be university math professors.
- Felix did everything. I mean, all the credit should go to Felix and the hard work he does. I'm just glad I can be his teacher and sort of guide him through and help him along and to reach his full potential.
LIONEL MOISE: As for what's next for Felix, he doesn't have all of those answers yet.
- Not sure what I want to do or like which schools I want to go into yet.
LIONEL MOISE: But his parents and teachers don't have a fraction of a doubt that when it comes to solving any future problems, Felix will be able to come up with the answers. Lionel Moise, ABC News, New York.
- Our thanks there to Lionel. By the way, he got 108 out of 108 questions right. Showing off there.
- Yeah, exactly. 270,000 students took the exam worldwide. I can barely help my son with his third grade math homework.
- So this is really amazing.
- I had AP classes, math was not one of them.
This transcript has been automatically generated and may not be 100% accurate.