Rubuta ci gaba don wannan sakin layi - A watan Disamba na 1941, an dakatar da makarantar saboda mamayewar Japan na Malaya
kuma an sake buɗe shi a cikin 1945 bayan mamayar Jafananci na Malaya. A wannan lokacin, cibiyoyi suna aiki gaba ɗaya ((统筹统办). Makarantar Firamare ta Jit Sin da sauran makarantu da yawa suna ƙarƙashin babban lokacin ma'aikata, Chung Hwa School ((中华学校), wanda ke da makarantu da yawa a wasu wurare a cikin yanki. Ga Makarantar Firamare ta Jit Sin, tana cikin masana'antar kunshin madara a titin Aston, wanda ke bayan ginin kungiyar Han Chiang. Saboda rashin ilimi a lokacin yaƙi, ilimin da aka bayar kyauta ne kuma yawan ɗalibai suna da yawa. Don Jit Sin reshe harabar akwai fiye da 1000 dalibai. A karshen shekara ta 1945, makarantu sun koma ga hanyoyin su na asali. An sake buɗe Makarantar Firamare ta Jit Sin a hukumance a cikin 1946.