PISA not only "ranks" the participating countries according to mean score, but also publishes the distribution of low-, mid-, and high-scorers in the measured literacy areas.
PISA 2000 surveyed 315,000 students in 43 countries. The following are some figures I generated for my dissertation, based on the PISA scores of 2000. They illustrate the scores for countries relevant to my research: the Nordic countries of Finland, Sweden, Denmark, Norway, and Iceland; South Korea, Japan, Germany, the United States, and the United Kingdom.
You can see the the PISA scores and distributions for all participating countries in the Relevant Links section listed on the right.