Professional interest declared, but take a look at DocsPlus – it’s an exam-friendly word processor that provides struggling readers and writers with literacy support across the curriculum (speech feedback, word prediction, mind-mapping, speech-supported spell checker, topic-specific word banks and writing frames etc), and it can also be used in exams in place of human scribes and readers for those who need additional access arrangements – http://www.cricksoft.com/DocsPlus