Centennial High School is housed in a 271,200-square-foot (25,200 m2) educational facility sitting on 55 acres (220,000 m2) within the city limits of Roswell.

The renovations include a new front entrance, new cafeteria lines, new HVAC units and upgrades to the auditorium.

Centennial has an award-winning media center, called the Learning Commons, managed by Dr. Christa Evans Heath.

[6] Parents help support the school's educational program through the Parent-Teacher-Student Association, Booster Club, and the Foundation of the Fine Arts.

Avalon is a nationally recognized magazine, frequently receiving awards from the Columbia Scholastic Press Association.

[citation needed] The School's news show is called "The Loft" It comes out weekly on Fridays and is made by the Audio-Visual Tech and Film 2 class.

The teacher in charge is Christopher Buechner, but he is now working with Joshua Herring, a new hire as of the 2024-2025 school year.

According to Best Delegate, "Centennial placed a distant third behind Port Charlotte High School and Gulf Coast High School at their hometown Georgia Tech GTMUN conference to begin the Fall, but the team roared back at Nationals NHSMUN to win Outstanding Large Delegation.

The team won Best Delegation at the Southern United States SUSMUN conference and placed third at an increasingly competitive Georgia Tech GTMUN.

In 2016–2017, the team competed at GTMUN, Vanderbilt's Model United Nations Conference XIII, Model Arab League, and UGAMUNC receiving several awards, including Best Position Paper, Honorable Mention and Outstanding Delegation awards for individual and overall delegations.

In the 2015–2016 school year, Centennial added a class in International Affairs[16] designed to cultivate young delegates through mentorship and instruction by senior members of the team.

[21] Both Centennial's boys' and girls' varsity cross country[22] teams qualified for the state meet eight years in a row, from 2007 to 2013.

Senior Brooke Koblitz led the girls' race and broke the school record [23] for 3.1 miles, finishing at 18:40.

Their 2024, Neon Forest, conducted by drum majors Sasha Correa and Robin Atkinson, got 3rd place in their first competition and didn't win any awards in the White Columns invitational.