The recess bell rings at the Akha elementary school in Mosul and children come thundering out of the classroom.
"None of us went to school when ISIS was here — we stayed at home," says Ali, who is in sixth grade.
Even basic math had a militaristic twist, using the image of bullets to teach children to count.
To make up for the lost years, the Iraqi government implemented a system where children could take makeup classes and then sit for exams.
If they passed, they moved into the grades they would have been in if school hadn't been interrupted.
Junior high and high school students were still sitting for exams while the elementary schools reopened at the beginning of October.
A caretaker at the school said two or three ISIS teachers had taught a few dozen children from ISIS families there. »