A lack of consensus on medium of teaching
All secondary schools, except for the 114 that have been exempted, will be teaching in the mother tongue this year.
The switch has caused heartache and controversy, with many parents angry their children will not be taught in English.
Statistics show the standard of education has dropped in recent years. Many students have a poor command of English and cannot understand other subjects taught in the language.
Educators have suggested students with poor English skills are better off being educated in their mother tongue.
However, parents want their children to have a good grounding in English, which they see as a symbol of prestige.
They say a good command of English, an international language, is essential for a good career in Hong Kong or abroad.