Bolsa-Escola Program: http://are.berkeley.edu/~sadoulet/papers/BolsaEscolaReport6-6.pdf

This report illustrates why and how the Bolsa-Escola Program was created and implemented in Brazil, but failed. Some of the important points was that studies conducted proved that while enrollment increased, drop-out rate did not. There was no motivation to stay enrolled for an entire year even though mothers were get stipends if their children completed a years worth of education.

WHY?!?!

Perhaps because monetary rewards are not very important to young school children....so what about World Cup tickets?
For every "x" number of months a student stays enrolled with a "C" average, they will get "x" number of tickets?