Does social class affect student rankings?

When compared to those in the rest of the world, students in America seem to perform less than satisfactory. In fact, America is ranked number 17 in global education, according to an article published on November 27, 2012. It's not necessarily bad, but we would like it to be a little higher.

People attribute America's low standing on the education scale to many things. Poor study habits, a lack of the good educators that other countries have, low test scores. The list goes on and on. One factor that hasn't really been discussed, is the effect of the distribution of social class on our education system.

In this report, we see how the distribution of social classes in America affects our educational ranking. There were many different findings that I found very interesting in this article.

• In every country, students at the bottom of the social class scale tend to perform worse than students higher on the social class scale. The U.S. average seems to be very low, partly because we have a lot of test takers/students from the lower class, more so than other nations. This made me think of the fact that, in America poor, low-income, lower class children can still attend public school. Regardless of how good or bad that education is, it's still an education. I thought of the poor children in other countries that can't afford to go to school at all, not even public school. 
• A sampling error in the U.S. test scores reported. It seems that a large portion of the disadvantages, lower-class American students are represented in America's test taker samples. Other countries wouldn't dream of publishing the low test scores of these students, they only publish the good grades of higher class students. The large representation of disadvantaged students' scores makes America's grades seem even worse. 
• Our scores would be better if they were compared to countries similar to us. The article says that if our test scores were placed next to those of similar, post-industrial countries (France, England, Germany), our reading scores would be much higher, and our math scores would be about the same. However, since we're compared to the whole world, many of the countries we are behind are vastly different than America, so our scores seem lower.

These are only a few of the different findings published in that report. There are so many more ways that the distribution of social class affects our educational ranking. I found this article to be very interesting, and I think that social class distribution should be taken into account more, when reporting the ranking of students around the world.