Bissan Younis looked dejected as she stood outside a cluster of tents surrounded by rubble and debris.

The modest group of structures was yet another school that has no room for her son, Kareem.

“During the two years of war, my children did not attend any kind of school because I was afraid for them. Everywhere there was bombing, fear, and terror, and I taught them on my own,” she told The Associated Press.

Instead of studying and socializing, they faced repeated displacement, fled airstrikes and shelling and often spent their days scouring for water and food for their families.

With a ceasefire reached last month largely holding, humanitarian officials are working frantically to re-open dozens of makeshift schools.

UNICEF estimates that over 630,000 Palestinian children missed out on school during the war.

UNRWA, the UN agency for Palestinian refugees, are also providing some education through their contracted teachers for about another 40,000.

Before the war, half the children of Gaza went to their schools that turned into shelters for displaced people.

One of the biggest obstacles is a lack of space.

Dozens of schools were severely damaged or destroyed.

Many are still being used as shelters for Palestinians who fled numerous times during the intense aerial bombardment of the tiny enclave.