And here you can see the percentage for each location class: the illiterate are in blue.
The illiterate in 1991 tended to cluster in locations with 2000 to 4000 inhabitants. The census for 1981 shows a much more even distribution, which is weird. I will comment on this on another post.
Anyway: this data is from 22 years ago. My guess is that now the cluster of illiterate people (the regime claims there are virtually no illiterate people, right?) and those with poor education levels in general cluster in locations with 10.000 to 50.000 inhabitants. Those areas as well as those locations with 50001 to 100 000 inhabitants are the ones where the democratic forces should focus now. They should go there, listen to the problems of people there and present a sound programme about how to improve education levels for real.