The number of students per year am excluded students aged 9-13 years-level worldwide, found that children in Thailand studying hard is a 1st-level age 10-11 years, 1200 hours per year.
Number of Hours per year of students in grades 9-13 year old children around the world that Thailand is ranked first in the weight class, age 10-11 years, 1,200 hours per year.
Number of hours to years of students at age 9-13 years all over the world, it was found that the children study hard is a 1 at age 10-11 years, 1 200 hours per year.