they also have high rates of illiteracy in of indigenous women were illiterate sep however these rates have been improving across cohorts by only of women aged to were illiterate inmujeres data provided to oecd mexico also underperforms in reading mexico s average score is points below the oecd average the percentage of low achievers among boys and girls in mexico is also twice as high as the average percentage in the oecd across subjects but the figures may mask even greater differences many disadvantaged yearolds leave school and are thus not captured by these statistics