The Koranic schools that operate in semi-legality in Bulgaria may teach very different curricula, but they all share a lack of transparency and oversight. You have reached a premium content area of TOL. To read this entire article please login if you are already a TOL subscriber. Not a subscriber? Annual membership costs only $55 per year for individuals ($33 for students) and organizational subscriptions start at $141 per year. Subscribe today for access to: Full access to the website, including premium articles videos, country reports and searchable archives (containing over 25,000 articles). You can subscribe here to gain access to the entire website.