Where You Can Find The Best Schools — And The Happiest Kids 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. Read the article and let us know what you think. Where does your country rank? Are you surprised by the results? Find out why Helen Doron English programmes build self esteem.