Last year, a USD 101 million shortfall in the budget of the agency, known as UNRWA, almost led to a delay in starting school.
Pierre Krahenbuhl told a news conference yesterday that the three Gulf countries came to the rescue last year and he hopes they will "renew the generosity this year."
"If we could have that, then we will be able to avoid another crisis this summer," he said.
Krahenbuhl stressed the importance of education for Palestinian refugees, many who have spent their lives in camps, as key to giving them hope for the future.
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Compared to school systems in the United States, Krahenbuhl said the Palestinian refugee school system would be the third largest after New York and Los Angeles.
He said UNRWA, "has been in challenging financial circumstances for many years and many decades, and the notion is to learn from last summer's large-scale crisis."
"We appeal to donors to be very engaged on their side also, to help us bridge this year's shortfall which is currently still at USD 80 million," he said, especially the three Gulf states.