In sciences, Thai students scored 426 points, much worse than the worldwide average of 489.
Science performance in PISA 2018 was close to that observed in all previous assessments, except in 2012, "said the overview of Latvian educational attainments". The main focus was on reading, with most students doing the test on computers.
It was all the more galling as per student spending in OECD member countries had risen more than 15 percent over the past decade, the report said.
In reading, four Chinese provinces with a combined population of more than 180 million- Beijing, Shanghai, Jiangsu and Zhejiang - scored significantly higher than other countries.
Estonia is top of the tables in reading and science skills and has the highest European aggregate score (1,592), followed by Finland (1,549).
However, it said it was anxious by the long-term trend of declining scores and the latest figures were equivalent of three-quarters of a year's education lower than scores recorded last decade. "Every dollar spent on education generates a huge return in terms of social and economic progress and is the foundation of an inclusive, prosperous future for all".
The PISA 2018 study shows that students are not happy at school.
The test found that girls significantly outperformed boys in reading on average across OECD countries, by the equivalent of almost a year of schooling. Schools in each country are randomly selected, and OECD says the selection of schools is kept as inclusive as possible so that student samples are drawn from a broad range of backgrounds and abilities.
Luxembourg's results fell under the OECD average, and were also lower than all three neighbouring countries.
Bigger European nations languished well behind in the rankings, with Britain in 14th place, Germany 20th and France 23rd.
Yet some countries have shown an impressive improvement over the past few years.
"High-performing countries generally take their teachers from the top 30 per cent of academic achievers".
"The findings also showed that students only read when they are forced to, or for a specific reason, not as an interest". And, in science, there was no difference between the performance of female and male students.
"My appeal to them is that everyone has to work together to turn this around", he said. These students, at a minimum, can interpret and recognize how simple situations can be approached mathematically, such as converting prices into different currencies, the organization said. This compares to only 2.4% in OECD countries.
In 2018, mean reading performance in Latvia was above the level observed when the country first participated in PISA in 2000, but below the level observed in 2015. Some people have cheered what they view as a national achievement, while others have argued that results from the country's most affluent regions are hardly representative, and may only mask the pervasive problem of education inequality.
Amin said the OECD reports also recorded a drop in the use of printed materials. Students in Victoria, Queensland and New South Wales performed on par with the OECD average, and students in South Australia, Tasmania and the Northern Territory performed at a level lower than the OECD average. Immigrant students performed on average less well in reading, by around one year of schooling. "Need for action" The Federation of Swiss Teachers (LCH) welcomed the good results in maths and science but said that the results for reading were "less than satisfactory".
Though the ranking of US students improved among those of other countries, scores were statistically unchanged compared to those from 2015, when the assessment was last conducted. While boys outperformed girls by an average of five points in mathematics across the countries tested, in Kosovo the scores were much more similar.
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