I don't want to be too critical, but this is a bit of a poor metric. A better scoring system would be +1 correct, 0 IDK, and -1 incorrect (or more negative even

I don't want to be too critical, but this is a bit of a poor metric. A better scoring system would be +1 correct, 0 IDK, and -1 incorrect (or more negative even). A score without a figure of merit is likely not informative on its own, at least the ability to lose points gives you the reference point of 0, with more negative answering more questions falsely and more positive meaning it answered more questions correctly than falsely.