For many years, the Ghanaian organization I work for, GILLBT, has done adult literacy in the various Ghanaian languages. Among the many benefits is the fact that it helps to children succeed in school. The benefit works two ways. First parents who attend a literacy class and read the Bible in their language are much more likely to put their children in school and keep them there. This is true even in parts of Ghana where some children never attend school even though it is obligatory.
Second children who fail and drop out of school often then attend an adult literacy class in their language. They return to school with their improved reading skills and succeed. This is in spite of the fact that the literacy class was in their language and school is in English.
In fact, this path to success in school has been so successful that it has been formalized in a government program known as Complementary Basic Education (CBE). Children who fail in school and drop out then attend a few months of instruction in reading and other subjects in their mother tongue then returned to the regular school system; not infrequently skipping grades after returning. GILLBT partners with the government in implementing CBE.
GILLBT does adult literacy so that people can read the Bible. As I have reported in this blog (links) , that has been wildly successful in both spiritual and practical terms.
Today, there are tens of thousands of Ghanaian teachers, nurses, pastors and others who initially failed school, but then succeeded after learning to read in their mother tongue in a GILLBT literacy class. I even know of one university lecturer. They and their families were lifted out of a life of poverty through literacy and the Bible in their language. This is all the more impressive because it is happening in the poorest parts of Ghana; places where the poverty rate reaches as high as 90% and half of those live in extreme poverty.