Actually, it’s because Idlib had an established educational board independent of Assad’s Nazi curriculum.
And believe it or not, Syria is an extremely impoverished country which inherited mythical levels of institutional decay from Assad’s kleptocratic regime. So as you may understand, centralised education is not top of the country’s agenda.
These disgruntled Assadists love making it all about the minorities.
There is an ongoing outcry against MoE for the abnormally difficult maths exam Damascus got, while Idlib got a simple one, highlighting what appears to be a systematic attempt to get more students from Idlib into higher education at the expense of other governorates.