The initial period period of schooling is flexible, often according to enjoys the technical standards and the social need, graduates ahead of time.

初期学习年限较灵活，常根据赏技术水准和社会需要，提前毕业。

youdao

Schooling consists of 6 years of primary education followed by a 3-year general or vocational training period and a 3-year academic or vocational program.

学校教育包括6年的小学和3年的普通职业培训，或3年的学院或者职业课程。

youdao

For those enrolled in secondary education, two courses at this level of schooling are completed in each academic year which corresponds to a period of ten months.

UNESCO: Integral School Literacy Programme