On Tuesday the school held an assembly where Chew commended the students and faculty for its hard work during the past year.
"When you apply for college, they may ask, 'What is your school's letter grade, and how does that reflect on you?'" Chew said to the students.
Grades are measured using four sets of criteria, he explained: math standardized test scores, English scores, graduation rate and college readiness.
The A grade was the highest in the school corporation this year.
Chew had the student body president, senior Katie Welch, and history teacher Tom Roach unveil the grade, and Chew said the A would be posted in the front of the building.