isreal do not control gaza
hamas does
hamas is the occupying power
hamas is the one which according to IHL

Territory is considered occupied when it is actually placed under the authority of the hostile army. The occupation extends only to the territory where such authority has been established and can be exercised

its upto hamas to maintain the public services such as hospitals and schools and bus services and everything a public authority has
its upto hamas

isreal is not the control authority

do you get it now

isreal as a neighbouring country does not need to run gaza schools, utilities, public services and such
but isreal is witohut legally needing to, isreal do warn palestinians when an area is being a warzone to give people time to move to safety. hamas when they abuse palestinians by using their homes schools and hositals as military strong holds do not give the palestinian population the same choose, alert. infact hamas demand palestinians dont move
hamas dont give out any aid received to the people for free, hamas send the best food to its troops as bribes/salary. and then sell the rest at illegal markets

learn this stuff

isreal did not take over gaza public authority.. hamas did