For the 4th year in a row, every student in this teacher's calculus class aced their AP test

Iswari Natarajan gets an A+ when it comes to preparing her students.

Natarajan teaches calculus at St. Mary's Academy, an all-girls high school in Englewood, Colorado. Over the last four years, every single one of her students has received a five on the Advanced Placement test, the highest score possible. Natarajan said she focuses on building their confidence and doesn't want them to ever feel pressure. "We are here to learn calculus, and having fun along the way was most important," she told CBS Denver.

The scores for this year came out in July, and "I did a double take to see every student got a five," she said. Students can receive college credit for taking AP tests, and student Anna Jonsen said she "screamed" and "cried" when she found out her score. Without Natarajan, Jonsen doesn't know how she would have done on the test. "She got us here," Jonsen said. "She really helped us."

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