What are the differences that would have an impact on student achievement?

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    1. The country of Singapore is about the size of the city of Chicago. 
    2. Singaporean teachers are among the most respected professionals in their country. 
    3. Parental support for education is huge in Singapore. 
    4. Singaporean teachers get more training and have more prep time than most U.S. teachers. They also work longer hours, averaging 10- to 12-hour days. 
    5. Most Singaporean primary-school classes have 30–40 students. 
    6. Daily math classes in Singapore are usually 60 minutes in length.