Yemeni students take an exam at a school in Sanaa, Yemen, Dec. 28, 2019. Yemen launched on Saturday semester exams for the academic year 2019-2020. (Photos: Xinhua)

A teacher distributes exam paper for students at a school in Sanaa, Yemen, Dec. 28, 2019. Yemen launched on Saturday semester exams for the academic year 2019-2020. (Photos: Xinhua)

A student runs at the corridor as he takes an exam at a school in Sanaa, Yemen, Dec. 28, 2019. Yemen launched on Saturday semester exams for the academic year 2019-2020. (Photos: Xinhua)

A Yemeni student sits on the ground as he takes an exam at a school in Sanaa, Yemen, Dec. 28, 2019. Yemen launched on Saturday semester exams for the academic year 2019-2020. (Photos: Xinhua)