Wow, hmm I took quiz 1 so far, and all my high confidence answer groups all scored much lower. For now I blame too much experience with easy multiple choice tests. I only got 19 out of 50 overall

Another problem, I think :

You marked your answers to 17 questions as '25% accurate'. Out of these, 1 answers were correct, for a success rate of 5.8823529411765 percent.

Now I thought I was choosing 25% when I didn't know the answer, but this seems to indicate that I had some information, and was biased against playing my (sometimes correct) hunches when marking 25%.