Matthew Cheung, 18, listens to instructions during his Calculus BC class Tuesday morning Feb. 2, 2016 at Davis Senior High School in Davis. Cheung is one of 12 students nationally to get a perfect score on his calculus exam during junior year.
Matthew Cheung, 18, listens to instructions during his Calculus BC class Tuesday morning Feb. 2, 2016 at Davis Senior High School in Davis. Cheung is one of 12 students nationally to get a perfect score on his calculus exam during junior year. Hector Amezcua hamezcua@sacbee.com
Matthew Cheung, 18, listens to instructions during his Calculus BC class Tuesday morning Feb. 2, 2016 at Davis Senior High School in Davis. Cheung is one of 12 students nationally to get a perfect score on his calculus exam during junior year. Hector Amezcua hamezcua@sacbee.com

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