To be fair I posted this link without looking too much at the main website before going to the girlfriends for the night. I have not tried doing a full exam on it yet. It looks like the part of the site should be more fun but it also appears that the site is incomplete and they are looking for answers for many of the exams. See at the very bottom of the page.
Someone used to post on this uk.d-i-y with his own similar web page on 2391 questions and answers a few years ago. I am not suggesting that they are the same person but more likely the new link is an idea of a previous poster. Christian McArdle rings a bell in my mind for the first (very enjoyable) Q&A site. I might be wrong.
Adam