The most appropriate word to fill the blank is "left" or "finished."
So the sentence would be: He said he left school in 1998.
Or: He said he finished school in 1998.
اذا كان لديك إجابة افضل او هناك خطأ في الإجابة علي سؤال He said he ___ school in 1998 اترك تعليق فورآ.