There is evidence that education technology can be effective, but perhaps the global community should be focussing on the hundreds of millions of children in school but not learning: https://www.theguardian.com/global-development/2018/feb/02/h...

Software for getting children reading - in their own language first - is a great first step.

See the work being done by the Global Learning XPRIZE: https://www.xprize.org/prizes/global-learning