My mother school我的母校
My former school我以前的学校
My original school我原来的学校(转学)
my former school 或者是 my old school
school学校的总说法吧
不同的学校说法不一样
小学primary
school
中学middle
school/secondary
school
高中high
school
大学university/college
my formmer school
My previous school