Nice work! My suggestion at the moment is to avoid excessively long true/false questions (unless you actually plan to modify them, but that can be incredibly ha

Nice work! My suggestion at the moment is to avoid excessively long true/false questions (unless you actually plan to modify them, but that can be incredibly hard), and to use Named Entity Recognition/detection and semantic similarity (Word2Vec/Glove) for multiple-choice questions. I guess you are already using the former, but with the latter you should be able to really constrain the options to something more "credible".