"Given our mobile population, the varying life issues of students, and the ongoing changes in math curriculum, some of our students just need additional months, if not another full school year, in order to earn their diploma," said Superintendent Emily Lembeck.
The school system also expects an increase in high school diplomas given out at its winter graduation.
Marietta's graduation rate for the class of 2016 was below the statewide average of 79.2 percent.
The graduation rate for the Cobb County School District for the same year was 83.8 percent, up from 81.4 percent for the prior school year, state Education Department data showed.
» 2016 – 75.1 percent
» 2015 – 74.7 percent
» 2014 – 71.4 percent
» 2013 – 66.5 percent
» 2012 – 61.97 percent
» 2011 – 59.2 percent
You can find information about Marietta City Schools, such as test scores, graduation rates, and school climate ratings at the Ultimate Atlanta School Guide