http://www.news.com.au/technology/appwatch/back-to-school-top-50-learning-apps-for-kids/story-fn81y8rt-1226557349142
Here comes Skoldatateket's tips for appar which are really useful for students with varying learning difficulties. Many of the apps are very good for ALL students. Info in Swedish I'm afraid but you could always try to convert in Google translate.
http://www.pedagogstockholm.se/surfplattor-och-appar-i-skolan/apptips-for-elever-i-behov-av-sarskilt-stod/
http://www.pedagogstockholm.se/surfplattor-och-appar-i-skolan/apptips-for-elever-i-behov-av-sarskilt-stod/