" The Organisation for Economic Co-operation and Development’s triennial international survey compared test scores from 65 countries.Happiness was ranked based on the percentage of students who agreed or disagreed with the statement “I feel happy at school.” Test scores were ranked based on the combined individual rankings of the students’ math, reading, and science scores.

(Source: BuzzFeed) "

So as stated, Indonesia has the most happiest students, which is I agree to because students in my School are mostly Cheery. 

But when you look at the first picture, Indonesia has the second worst test Scores. I have known that since years of school, and the fact that is actually true. From what my teacher said that 'Indonesian kids has bad test scores/grades but they don't seem to care about it, They just Let it Go and continue on their social lives."*heard from memory/. I mean, Social life? sure, just don't forget your grades. 

I have a pretty bad grade too but oh well.