UX nit: would have preferred question-by-question feedback on right answer and overall score, quite a lot to get through 25 questions before you get any reward for your effort :)
By the time I saw the answers, I couldn't remember why I guessed which way on each question.
When is the last time you took an in-person test where the proctor told you if you were right/wrong after every question?
You need to grade current knowledge. In fact, I would have removed the multiple choice altogether for this test and had a input(type=text)
EDIT: OK, ok: I get it, it is just a fun website, not the BAR.