Handicraft class was a required course for most primary school students in China.

在中国的大部分小学里，手工课都是必修课。

youdao

Most critically, many primary school children failed to proceed to secondary level due to financial constraints.

UNESCO: Family Basic Education (FABE)

As a result, most children graduate from the primary school level without having mastered basic literacy and numeracy skills, and many of them fail to proceed to secondary level.

UNESCO: Integrated Intergenerational Literacy Project (IILP)

Most of us have sung them since our primary school days.

BBC: A Point of View: The joy of Christmas carols