What aspect of Thailand's education system is noted?

The education system in Thailand is notably compulsory for nine years, which means that it is required for children to attend school from a young age. This compulsory education typically includes six years of primary schooling followed by three years of lower secondary education. The emphasis on making education mandatory aligns with the country's goals to improve literacy rates and provide a foundation for further education and vocational training.

This nine-year compulsory education is vital for ensuring that all children have access to basic education, which in turn supports national development and the workforce's skill level. The other choices do not accurately reflect the structure of Thailand's education system. Non-mandatory education would suggest that attendance is optional, which is not the case. A focus solely on higher education excludes the foundational stages that are crucial in early development. While vocational training is an important aspect of the education system, it is part of the broader compulsory framework rather than the only focus.