I taught in the Thai education system for more than three years and during this time learned quickly how bad the education system in Thailand really is.
Plagued by inadequate funding, huge class sizes (more than 50 students to a class), terrible teacher training, lazy students and a system that forces teachers to pass students even though they've actually failed - there doesn't seem to be much hope education in Thailand will improve any time soon.
I taught in a private bi-lingual school, so had many less problems than exist in government schools. Even here though, the school falls under Ministry of Education bureaucracy, which is one of the most ridiculously inept in the world. Rules change every semester, new guidelines are handed down to teachers regarding course content, lesson plans, testing etc at the beginning of each new semester, then change again the following semester.