OCR has too many errors

Downloaded app for my learning disabled son who cant read. The app did what it said and converted to text that could be selected and then read using the speak command. However no matter what font or text size imaged the ocr software was full of errors. So much so that it was always unintelligible.

BOBH65 about Doc Scanner + OCR Free: PDF scanner to scan document, receipt, photo, v1.3