I took a class on international economic development when in grad school. The class spent some time going through the various theories of economic development, and what has and hasn't worked in terms of aid programs. One of the surprises in the class I learned was that education isn't a big driver for economic development. That's not to say education isn't important, but that if you make a huge effort to education your population, the payoff isn't going to be that great, other factors need to be considered.