I just LOVE this idea. It should be instituted in the UK and used to replace automatic releases after half a sentence has been served.
It would need to be rather better in the way it was introduced than described below and should be much wider in its educational scope.
Inmates could be assessed for educational abilities and then given carefully monitored educational incentives.
Those with poor arithmetical skills could be given targets; English skills could be improved; better educated prisoners could begin a foreign language.
The biggest drawback would be the incessant attempts by leftists to dilute standards and their inevitable attempts to introduce leftist thinking by stealth - a lot like they do in our current education system!
http://www.dailymail.co.uk/news/article-2164978/Prisoners-Brazilian-jail-days-sentence-book-read.html