Malaysia, Indonesia, Philippines, Brunei Laos, Timor Leste.
World Average Score: 82.
Thailand: 89.
The average score is not 100 as is often believed.
Source: Google - Average IQ by Country 2023 - World Population Review.
See also Thai PBS 2022:
Thai IQ Levels on the Rise.
Other considerations:
1. Who took the tests?
PISA and similar tests survey kids in state schools.
But Thailand has a high percentage attending International Schools so those potentially achieving the highest scores are not included, lowering the score.
2. There is controversy surrounding the idea of accurately measuring Intelligence.
What are the tests measuring?
Verbal Intelligence?
Numerical Intelligence?
Practical Intelligence?
Reasoning Intelligence?
Emotional Intelligence?
Spatial Intelligence?
Ability to follow or create a logical and reasoned argument?
Ability to compare and assess contrasting views or information?
3. It is held that non-verbal IQ tests featuring shapes, patterns, and sequences are measuring a specific ability, Spatial Intelligence, and cannot be generalised to suggest overall Intelligence.
They are invalid.
And practice increases your score, revealing a basic flaw.
A genuine Intelligence test must cover a wider range.
4. Motivation.
How motivated are the students to do the test?
If you think it's boring or pointless you don't apply yourself.
Your score goes down.
Many thanks for taking the trouble to alert me to this.
A more pressing issue is Thailand's PISA scores.
This requires serious government review of teaching aims and range of methods used, Singapore being a model.